---
title: "Developer tools - Glossary | MDN"
chunk: 2/3
source: "https://developer.mozilla.org/en-US/docs/Glossary/Developer_Tools"
category: "reference"
tags: "web, html, css, javascript, documentation"
date_saved: "2026-05-05T05:29:38.185006+00:00"
instance: "kb-cron"
---

##  Help improve MDN 
[Learn how to contribute](https://developer.mozilla.org/en-US/docs/MDN/Community/Getting_started)
This page was last modified on Jul 18, 2025 by [MDN contributors](https://developer.mozilla.org/en-US/docs/Glossary/Developer_Tools/contributors.txt). [View this page on GitHub](https://github.com/mdn/content/blob/main/files/en-us/glossary/developer_tools/index.md?plain=1 "Folder: en-us/glossary/developer_tools \(Opens in a new tab\)") • [Report a problem with this content](https://github.com/mdn/content/issues/new?template=page-report.yml&mdn-url=https%3A%2F%2Fdeveloper.mozilla.org%2Fen-US%2Fdocs%2FGlossary%2FDeveloper_Tools&metadata=%3C%21--+Do+not+make+changes+below+this+line+--%3E%0A%3Cdetails%3E%0A%3Csummary%3EPage+report+details%3C%2Fsummary%3E%0A%0A*+Folder%3A+%60en-us%2Fglossary%2Fdeveloper_tools%60%0A*+MDN+URL%3A+https%3A%2F%2Fdeveloper.mozilla.org%2Fen-US%2Fdocs%2FGlossary%2FDeveloper_Tools%0A*+GitHub+URL%3A+https%3A%2F%2Fgithub.com%2Fmdn%2Fcontent%2Fblob%2Fmain%2Ffiles%2Fen-us%2Fglossary%2Fdeveloper_tools%2Findex.md%0A*+Last+commit%3A+https%3A%2F%2Fgithub.com%2Fmdn%2Fcontent%2Fcommit%2F13839b2979cc244034ffb1fe243240778b0cd23f%0A*+Document+last+modified%3A+2025-07-18T15%3A04%3A24.000Z%0A%0A%3C%2Fdetails%3E "This will take you to GitHub to file a new issue.")
  1. [Glossary](https://developer.mozilla.org/en-US/docs/Glossary)
  2. 1. [Abstraction](https://developer.mozilla.org/en-US/docs/Glossary/Abstraction)
    2. [Accent](https://developer.mozilla.org/en-US/docs/Glossary/Accent)
    3. [Accessibility](https://developer.mozilla.org/en-US/docs/Glossary/Accessibility)
    4. [Accessibility tree](https://developer.mozilla.org/en-US/docs/Glossary/Accessibility_tree)
    5. [Accessible description](https://developer.mozilla.org/en-US/docs/Glossary/Accessible_description)
    6. [Accessible name](https://developer.mozilla.org/en-US/docs/Glossary/Accessible_name)
    7. [Adobe Flash](https://developer.mozilla.org/en-US/docs/Glossary/Adobe_Flash)
    8. [Advance measure](https://developer.mozilla.org/en-US/docs/Glossary/Advance_measure)
    9. [Ajax](https://developer.mozilla.org/en-US/docs/Glossary/AJAX)
    10. [Algorithm](https://developer.mozilla.org/en-US/docs/Glossary/Algorithm)
    11. [Alignment container](https://developer.mozilla.org/en-US/docs/Glossary/Alignment_Container)
    12. [Alignment subject](https://developer.mozilla.org/en-US/docs/Glossary/Alignment_Subject)
    13. [Alpha (alpha channel)](https://developer.mozilla.org/en-US/docs/Glossary/Alpha)
    14. [ALPN](https://developer.mozilla.org/en-US/docs/Glossary/ALPN)
    15. [API](https://developer.mozilla.org/en-US/docs/Glossary/API)
    16. [Apple Safari](https://developer.mozilla.org/en-US/docs/Glossary/Apple_Safari)
    17. [Application context](https://developer.mozilla.org/en-US/docs/Glossary/Application_context)
    18. [Argument](https://developer.mozilla.org/en-US/docs/Glossary/Argument)
    19. [ARIA](https://developer.mozilla.org/en-US/docs/Glossary/ARIA)
    20. [ARPA](https://developer.mozilla.org/en-US/docs/Glossary/ARPA)
    21. [ARPANET](https://developer.mozilla.org/en-US/docs/Glossary/Arpanet)
    22. [Array](https://developer.mozilla.org/en-US/docs/Glossary/Array)
    23. [ASCII](https://developer.mozilla.org/en-US/docs/Glossary/ASCII)
    24. [Aspect ratio](https://developer.mozilla.org/en-US/docs/Glossary/Aspect_ratio)
    25. [Asynchronous](https://developer.mozilla.org/en-US/docs/Glossary/Asynchronous)
    26. [ATAG](https://developer.mozilla.org/en-US/docs/Glossary/ATAG)
    27. [Attribute](https://developer.mozilla.org/en-US/docs/Glossary/Attribute)
    28. [Authentication](https://developer.mozilla.org/en-US/docs/Glossary/Authentication)
    29. [Authenticator](https://developer.mozilla.org/en-US/docs/Glossary/Authenticator)
    30. [Bandwidth](https://developer.mozilla.org/en-US/docs/Glossary/Bandwidth)
    31. [Base64](https://developer.mozilla.org/en-US/docs/Glossary/Base64)
    32. [Baseline](https://developer.mozilla.org/en-US/docs/Glossary/Baseline)
      1. [Baseline (compatibility)](https://developer.mozilla.org/en-US/docs/Glossary/Baseline/Compatibility)
      2. [Baseline (typography)](https://developer.mozilla.org/en-US/docs/Glossary/Baseline/Typography)
    33. [BCP 47 language tag](https://developer.mozilla.org/en-US/docs/Glossary/BCP_47_language_tag)
    34. [Beacon](https://developer.mozilla.org/en-US/docs/Glossary/Beacon)
    35. [Bézier curve](https://developer.mozilla.org/en-US/docs/Glossary/Bezier_curve)
    36. [bfcache](https://developer.mozilla.org/en-US/docs/Glossary/bfcache)
    37. [BiDi](https://developer.mozilla.org/en-US/docs/Glossary/BiDi)
    38. [BigInt](https://developer.mozilla.org/en-US/docs/Glossary/BigInt)
    39. [Binding](https://developer.mozilla.org/en-US/docs/Glossary/Binding)
    40. [Bitwise flags](https://developer.mozilla.org/en-US/docs/Glossary/Bitwise_flags)
    41. [Blink](https://developer.mozilla.org/en-US/docs/Glossary/Blink)
    42. [blink element (<blink> tag)](https://developer.mozilla.org/en-US/docs/Glossary/blink_element)
    43. [Block](https://developer.mozilla.org/en-US/docs/Glossary/Block)
      1. [Block (CSS)](https://developer.mozilla.org/en-US/docs/Glossary/Block/CSS)
      2. [Block (scripting)](https://developer.mozilla.org/en-US/docs/Glossary/Block/Scripting)
    44. [Block cipher mode of operation](https://developer.mozilla.org/en-US/docs/Glossary/Block_cipher_mode_of_operation)
    45. [Block-level content](https://developer.mozilla.org/en-US/docs/Glossary/Block-level_content)
    46. [Boolean](https://developer.mozilla.org/en-US/docs/Glossary/Boolean)
      1. [Boolean (JavaScript)](https://developer.mozilla.org/en-US/docs/Glossary/Boolean/JavaScript)
      2. [Boolean attribute (ARIA)](https://developer.mozilla.org/en-US/docs/Glossary/Boolean/ARIA)
      3. [Boolean attribute (HTML)](https://developer.mozilla.org/en-US/docs/Glossary/Boolean/HTML)
    47. [Bounding box](https://developer.mozilla.org/en-US/docs/Glossary/Bounding_box)
    48. [Breadcrumb](https://developer.mozilla.org/en-US/docs/Glossary/Breadcrumb)
    49. [Brotli compression](https://developer.mozilla.org/en-US/docs/Glossary/Brotli_compression)
    50. [Browser](https://developer.mozilla.org/en-US/docs/Glossary/Browser)
    51. [Browsing context](https://developer.mozilla.org/en-US/docs/Glossary/Browsing_context)
    52. [Buffer](https://developer.mozilla.org/en-US/docs/Glossary/Buffer)
    53. [Bun](https://developer.mozilla.org/en-US/docs/Glossary/Bun)
    54. [Cache](https://developer.mozilla.org/en-US/docs/Glossary/Cache)
    55. [Cacheable](https://developer.mozilla.org/en-US/docs/Glossary/Cacheable)
    56. [CalDAV](https://developer.mozilla.org/en-US/docs/Glossary/CalDAV)
    57. [Call stack](https://developer.mozilla.org/en-US/docs/Glossary/Call_stack)
    58. [Callback function](https://developer.mozilla.org/en-US/docs/Glossary/Callback_function)
    59. [Camel case](https://developer.mozilla.org/en-US/docs/Glossary/Camel_case)
    60. [Canonical order](https://developer.mozilla.org/en-US/docs/Glossary/Canonical_order)
    61. [Canvas](https://developer.mozilla.org/en-US/docs/Glossary/Canvas)
    62. [Card sorting](https://developer.mozilla.org/en-US/docs/Glossary/Card_sorting)
    63. [CardDAV](https://developer.mozilla.org/en-US/docs/Glossary/CardDAV)
    64. [Caret](https://developer.mozilla.org/en-US/docs/Glossary/Caret)
    65. [CDN](https://developer.mozilla.org/en-US/docs/Glossary/CDN)
    66. [Certificate authority](https://developer.mozilla.org/en-US/docs/Glossary/Certificate_authority)
    67. [Certified](https://developer.mozilla.org/en-US/docs/Glossary/Certified)
    68. [Challenge-response authentication](https://developer.mozilla.org/en-US/docs/Glossary/Challenge)
    69. [Character](https://developer.mozilla.org/en-US/docs/Glossary/Character)
    70. [Character encoding](https://developer.mozilla.org/en-US/docs/Glossary/Character_encoding)
    71. [Character reference](https://developer.mozilla.org/en-US/docs/Glossary/Character_reference)
    72. [Character set](https://developer.mozilla.org/en-US/docs/Glossary/Character_set)
    73. [Chrome](https://developer.mozilla.org/en-US/docs/Glossary/Chrome)
    74. [CIA](https://developer.mozilla.org/en-US/docs/Glossary/CIA)
    75. [Cipher](https://developer.mozilla.org/en-US/docs/Glossary/Cipher)
    76. [Cipher suite](https://developer.mozilla.org/en-US/docs/Glossary/Cipher_suite)
    77. [Ciphertext](https://developer.mozilla.org/en-US/docs/Glossary/Ciphertext)
    78. [Class](https://developer.mozilla.org/en-US/docs/Glossary/Class)
    79. [Client-side rendering (CSR)](https://developer.mozilla.org/en-US/docs/Glossary/CSR)
    80. [Closure](https://developer.mozilla.org/en-US/docs/Glossary/Closure)
    81. [Cloud](https://developer.mozilla.org/en-US/docs/Glossary/Cloud)
    82. [Cloud computing](https://developer.mozilla.org/en-US/docs/Glossary/Cloud_computing)
    83. [CMS](https://developer.mozilla.org/en-US/docs/Glossary/CMS)
    84. [Code point](https://developer.mozilla.org/en-US/docs/Glossary/Code_point)
    85. [Code splitting](https://developer.mozilla.org/en-US/docs/Glossary/Code_splitting)
    86. [Code unit](https://developer.mozilla.org/en-US/docs/Glossary/Code_unit)
    87. [Codec](https://developer.mozilla.org/en-US/docs/Glossary/Codec)
    88. [Color space](https://developer.mozilla.org/en-US/docs/Glossary/Color_space)
    89. [Color wheel](https://developer.mozilla.org/en-US/docs/Glossary/Color_wheel)
    90. [Compile](https://developer.mozilla.org/en-US/docs/Glossary/Compile)
    91. [Compile time](https://developer.mozilla.org/en-US/docs/Glossary/Compile_time)
    92. [Composite operation](https://developer.mozilla.org/en-US/docs/Glossary/Composite_operation)
    93. [Compression Dictionary Transport](https://developer.mozilla.org/en-US/docs/Glossary/Compression_dictionary_transport)
    94. [Computer programming](https://developer.mozilla.org/en-US/docs/Glossary/Computer_Programming)
    95. [Conditional](https://developer.mozilla.org/en-US/docs/Glossary/Conditional)
    96. [Constant](https://developer.mozilla.org/en-US/docs/Glossary/Constant)
    97. [Constructor](https://developer.mozilla.org/en-US/docs/Glossary/Constructor)
    98. [Content header](https://developer.mozilla.org/en-US/docs/Glossary/Content_header)
    99. [Continuous integration](https://developer.mozilla.org/en-US/docs/Glossary/Continuous_integration)
    100. [Continuous media](https://developer.mozilla.org/en-US/docs/Glossary/Continuous_Media)
    101. [Control flow](https://developer.mozilla.org/en-US/docs/Glossary/Control_flow)
    102. [Cookie](https://developer.mozilla.org/en-US/docs/Glossary/Cookie)
    103. [Copyleft](https://developer.mozilla.org/en-US/docs/Glossary/Copyleft)
    104. [CORS](https://developer.mozilla.org/en-US/docs/Glossary/CORS)
    105. [CORS-safelisted request header](https://developer.mozilla.org/en-US/docs/Glossary/CORS-safelisted_request_header)
    106. [CORS-safelisted response header](https://developer.mozilla.org/en-US/docs/Glossary/CORS-safelisted_response_header)
    107. [Crawler](https://developer.mozilla.org/en-US/docs/Glossary/Crawler)
    108. [Credential](https://developer.mozilla.org/en-US/docs/Glossary/Credential)
    109. [CRLF](https://developer.mozilla.org/en-US/docs/Glossary/CRLF)
    110. [Cross Axis](https://developer.mozilla.org/en-US/docs/Glossary/Cross_Axis)
    111. [Cross-site request forgery (CSRF)](https://developer.mozilla.org/en-US/docs/Glossary/CSRF)
    112. [Cross-site scripting (XSS)](https://developer.mozilla.org/en-US/docs/Glossary/Cross-site_scripting)
    113. [CRUD](https://developer.mozilla.org/en-US/docs/Glossary/CRUD)
    114. [Cryptanalysis](https://developer.mozilla.org/en-US/docs/Glossary/Cryptanalysis)
    115. [Cryptography](https://developer.mozilla.org/en-US/docs/Glossary/Cryptography)
    116. [CSP](https://developer.mozilla.org/en-US/docs/Glossary/CSP)
    117. [CSS](https://developer.mozilla.org/en-US/docs/Glossary/CSS)
    118. [CSS Object Model (CSSOM)](https://developer.mozilla.org/en-US/docs/Glossary/CSSOM)
    119. [CSS pixel](https://developer.mozilla.org/en-US/docs/Glossary/CSS_pixel)
    120. [CSS preprocessor](https://developer.mozilla.org/en-US/docs/Glossary/CSS_preprocessor)
    121. [Cumulative Layout Shift (CLS)](https://developer.mozilla.org/en-US/docs/Glossary/CLS)
    122. [Data structure](https://developer.mozilla.org/en-US/docs/Glossary/Data_structure)
    123. [Database](https://developer.mozilla.org/en-US/docs/Glossary/Database)
    124. [Debounce](https://developer.mozilla.org/en-US/docs/Glossary/Debounce)
    125. [Decryption](https://developer.mozilla.org/en-US/docs/Glossary/Decryption)
    126. [Deep copy](https://developer.mozilla.org/en-US/docs/Glossary/Deep_copy)
    127. [Delta](https://developer.mozilla.org/en-US/docs/Glossary/Delta)
    128. [Denial of Service (DoS)](https://developer.mozilla.org/en-US/docs/Glossary/Denial_of_Service)
    129. [Deno](https://developer.mozilla.org/en-US/docs/Glossary/Deno)
    130. [Descriptor (CSS)](https://developer.mozilla.org/en-US/docs/Glossary/CSS_Descriptor)
    131. [Deserialization](https://developer.mozilla.org/en-US/docs/Glossary/Deserialization)
    132. _[Developer tools](https://developer.mozilla.org/en-US/docs/Glossary/Developer_Tools)_
    133. [Device pixel](https://developer.mozilla.org/en-US/docs/Glossary/Device_pixel)
    134. [Digital certificate](https://developer.mozilla.org/en-US/docs/Glossary/Digital_certificate)
    135. [Digital signature](https://developer.mozilla.org/en-US/docs/Glossary/Digital_signature)
    136. [Distributed Denial of Service (DDoS)](https://developer.mozilla.org/en-US/docs/Glossary/Distributed_Denial_of_Service)
    137. [DMZ](https://developer.mozilla.org/en-US/docs/Glossary/DMZ)
    138. [DNS](https://developer.mozilla.org/en-US/docs/Glossary/DNS)
    139. [Doctype](https://developer.mozilla.org/en-US/docs/Glossary/Doctype)
    140. [Document directive](https://developer.mozilla.org/en-US/docs/Glossary/Document_directive)
    141. [Document environment](https://developer.mozilla.org/en-US/docs/Glossary/Document_environment)
    142. [DOM (Document Object Model)](https://developer.mozilla.org/en-US/docs/Glossary/DOM)
    143. [Domain](https://developer.mozilla.org/en-US/docs/Glossary/Domain)
    144. [Domain name](https://developer.mozilla.org/en-US/docs/Glossary/Domain_name)
    145. [Domain sharding](https://developer.mozilla.org/en-US/docs/Glossary/Domain_sharding)
    146. [Dominator](https://developer.mozilla.org/en-US/docs/Glossary/Dominator)
    147. [DSL](https://developer.mozilla.org/en-US/docs/Glossary/DSL)
      1. [DSL (Digital Subscriber Line)](https://developer.mozilla.org/en-US/docs/Glossary/DSL/Digital_subscriber_line)
      2. [DSL (Domain-Specific Language)](https://developer.mozilla.org/en-US/docs/Glossary/DSL/Domain_specific_language)
    148. [DTLS (Datagram Transport Layer Security)](https://developer.mozilla.org/en-US/docs/Glossary/DTLS)
    149. [DTMF (Dual-Tone Multi-Frequency signaling)](https://developer.mozilla.org/en-US/docs/Glossary/DTMF)
    150. [Dynamic typing](https://developer.mozilla.org/en-US/docs/Glossary/Dynamic_typing)
    151. [ECMA](https://developer.mozilla.org/en-US/docs/Glossary/ECMA)
    152. [ECMAScript](https://developer.mozilla.org/en-US/docs/Glossary/ECMAScript)
    153. [Effective connection type](https://developer.mozilla.org/en-US/docs/Glossary/Effective_connection_type)
    154. [Element](https://developer.mozilla.org/en-US/docs/Glossary/Element)
    155. [Encapsulation](https://developer.mozilla.org/en-US/docs/Glossary/Encapsulation)
    156. [Encryption](https://developer.mozilla.org/en-US/docs/Glossary/Encryption)
    157. [Endianness](https://developer.mozilla.org/en-US/docs/Glossary/Endianness)
    158. [Engine](https://developer.mozilla.org/en-US/docs/Glossary/Engine)
      1. [JavaScript engine](https://developer.mozilla.org/en-US/docs/Glossary/Engine/JavaScript)
      2. [Rendering engine](https://developer.mozilla.org/en-US/docs/Glossary/Engine/Rendering)
    159. [Entity](https://developer.mozilla.org/en-US/docs/Glossary/Entity)
    160. [Entity header](https://developer.mozilla.org/en-US/docs/Glossary/Entity_header)
    161. [Enumerated](https://developer.mozilla.org/en-US/docs/Glossary/Enumerated)
    162. [Escape character](https://developer.mozilla.org/en-US/docs/Glossary/Escape_character)
    163. [Event](https://developer.mozilla.org/en-US/docs/Glossary/Event)
    164. [Exception](https://developer.mozilla.org/en-US/docs/Glossary/Exception)
    165. [EXIF](https://developer.mozilla.org/en-US/docs/Glossary/EXIF)
    166. [Expando](https://developer.mozilla.org/en-US/docs/Glossary/Expando)
    167. [Extrinsic size](https://developer.mozilla.org/en-US/docs/Glossary/Extrinsic_size)
    168. [Fallback alignment](https://developer.mozilla.org/en-US/docs/Glossary/Fallback_Alignment)
    169. [Falsy](https://developer.mozilla.org/en-US/docs/Glossary/Falsy)
    170. [Favicon](https://developer.mozilla.org/en-US/docs/Glossary/Favicon)
    171. [Federated identity](https://developer.mozilla.org/en-US/docs/Glossary/Federated_identity)
    172. [Fetch directive](https://developer.mozilla.org/en-US/docs/Glossary/Fetch_directive)
    173. [Fetch metadata request header](https://developer.mozilla.org/en-US/docs/Glossary/Fetch_metadata_request_header)
    174. [Fingerprinting](https://developer.mozilla.org/en-US/docs/Glossary/Fingerprinting)
    175. [Firefox OS](https://developer.mozilla.org/en-US/docs/Glossary/Firefox_OS)
    176. [Firewall](https://developer.mozilla.org/en-US/docs/Glossary/Firewall)
    177. [First Contentful Paint (FCP)](https://developer.mozilla.org/en-US/docs/Glossary/First_contentful_paint)
    178. [First CPU idle](https://developer.mozilla.org/en-US/docs/Glossary/First_CPU_idle)
    179. [First Input Delay (FID)](https://developer.mozilla.org/en-US/docs/Glossary/First_input_delay)
    180. [First Meaningful Paint (FMP)](https://developer.mozilla.org/en-US/docs/Glossary/First_meaningful_paint)
    181. [First Paint (FP)](https://developer.mozilla.org/en-US/docs/Glossary/First_paint)
    182. [First-class function](https://developer.mozilla.org/en-US/docs/Glossary/First-class_Function)
    183. [Flex](https://developer.mozilla.org/en-US/docs/Glossary/Flex)
    184. [Flex container](https://developer.mozilla.org/en-US/docs/Glossary/Flex_Container)
    185. [Flex item](https://developer.mozilla.org/en-US/docs/Glossary/Flex_Item)
    186. [Flexbox](https://developer.mozilla.org/en-US/docs/Glossary/Flexbox)
    187. [Flow relative values](https://developer.mozilla.org/en-US/docs/Glossary/Flow_relative_values)
    188. [Forbidden request header](https://developer.mozilla.org/en-US/docs/Glossary/Forbidden_request_header)
    189. [Forbidden response header name](https://developer.mozilla.org/en-US/docs/Glossary/Forbidden_response_header_name)
    190. [Fork](https://developer.mozilla.org/en-US/docs/Glossary/Fork)
    191. [Fragmentainer](https://developer.mozilla.org/en-US/docs/Glossary/Fragmentainer)
    192. [Frame rate (FPS)](https://developer.mozilla.org/en-US/docs/Glossary/FPS)
    193. [FTP](https://developer.mozilla.org/en-US/docs/Glossary/FTP)
    194. [FTU](https://developer.mozilla.org/en-US/docs/Glossary/FTU)
    195. [Function](https://developer.mozilla.org/en-US/docs/Glossary/Function)
    196. [Fuzz testing](https://developer.mozilla.org/en-US/docs/Glossary/Fuzzing)
    197. [Gamut](https://developer.mozilla.org/en-US/docs/Glossary/Gamut)
    198. [Garbage collection](https://developer.mozilla.org/en-US/docs/Glossary/Garbage_collection)
    199. [Gecko](https://developer.mozilla.org/en-US/docs/Glossary/Gecko)
    200. [General header](https://developer.mozilla.org/en-US/docs/Glossary/General_header)
    201. [GIF](https://developer.mozilla.org/en-US/docs/Glossary/GIF)
    202. [Git](https://developer.mozilla.org/en-US/docs/Glossary/Git)
    203. [Global object](https://developer.mozilla.org/en-US/docs/Glossary/Global_object)
    204. [Global scope](https://developer.mozilla.org/en-US/docs/Glossary/Global_scope)
    205. [Global variable](https://developer.mozilla.org/en-US/docs/Glossary/Global_variable)
    206. [Glyph](https://developer.mozilla.org/en-US/docs/Glossary/Glyph)
    207. [Google Chrome](https://developer.mozilla.org/en-US/docs/Glossary/Google_Chrome)
    208. [GPL](https://developer.mozilla.org/en-US/docs/Glossary/GPL)
    209. [GPU](https://developer.mozilla.org/en-US/docs/Glossary/GPU)
    210. [Graceful degradation](https://developer.mozilla.org/en-US/docs/Glossary/Graceful_degradation)
    211. [Grid](https://developer.mozilla.org/en-US/docs/Glossary/Grid)
    212. [Grid areas](https://developer.mozilla.org/en-US/docs/Glossary/Grid_Areas)
    213. [Grid Axis](https://developer.mozilla.org/en-US/docs/Glossary/Grid_Axis)
    214. [Grid Cell](https://developer.mozilla.org/en-US/docs/Glossary/Grid_Cell)
    215. [Grid Column](https://developer.mozilla.org/en-US/docs/Glossary/Grid_Column)
    216. [Grid container](https://developer.mozilla.org/en-US/docs/Glossary/Grid_Container)
    217. [Grid lines](https://developer.mozilla.org/en-US/docs/Glossary/Grid_Lines)
    218. [Grid Row](https://developer.mozilla.org/en-US/docs/Glossary/Grid_Row)
    219. [Grid Tracks](https://developer.mozilla.org/en-US/docs/Glossary/Grid_Tracks)
    220. [Guaranteed-invalid value](https://developer.mozilla.org/en-US/docs/Glossary/guaranteed_invalid_value)
    221. [Gutters](https://developer.mozilla.org/en-US/docs/Glossary/Gutters)
    222. [gzip compression](https://developer.mozilla.org/en-US/docs/Glossary/gzip_compression)
    223. [Hash function](https://developer.mozilla.org/en-US/docs/Glossary/Hash_function)
    224. [Hash routing](https://developer.mozilla.org/en-US/docs/Glossary/Hash_routing)
    225. [Head](https://developer.mozilla.org/en-US/docs/Glossary/Head)
    226. [High-level programming language](https://developer.mozilla.org/en-US/docs/Glossary/High-level_programming_language)
    227. [HMAC](https://developer.mozilla.org/en-US/docs/Glossary/HMAC)
    228. [Hoisting](https://developer.mozilla.org/en-US/docs/Glossary/Hoisting)
    229. [HOL blocking](https://developer.mozilla.org/en-US/docs/Glossary/Head_of_line_blocking)
    230. [Host](https://developer.mozilla.org/en-US/docs/Glossary/Host)
    231. [Hotlink](https://developer.mozilla.org/en-US/docs/Glossary/Hotlink)
    232. [Houdini](https://developer.mozilla.org/en-US/docs/Glossary/Houdini)
    233. [HPKP](https://developer.mozilla.org/en-US/docs/Glossary/HPKP)
    234. [HSTS](https://developer.mozilla.org/en-US/docs/Glossary/HSTS)
    235. [HTML](https://developer.mozilla.org/en-US/docs/Glossary/HTML)
    236. [HTML color codes](https://developer.mozilla.org/en-US/docs/Glossary/html_color_codes)
    237. [HTML5](https://developer.mozilla.org/en-US/docs/Glossary/HTML5)
    238. [HTTP](https://developer.mozilla.org/en-US/docs/Glossary/HTTP)
    239. [HTTP content](https://developer.mozilla.org/en-US/docs/Glossary/HTTP_Content)
    240. [HTTP header](https://developer.mozilla.org/en-US/docs/Glossary/HTTP_header)
    241. [HTTP/2](https://developer.mozilla.org/en-US/docs/Glossary/HTTP_2)
    242. [HTTP/3](https://developer.mozilla.org/en-US/docs/Glossary/HTTP_3)
    243. [HTTPS](https://developer.mozilla.org/en-US/docs/Glossary/HTTPS)
    244. [HTTPS RR](https://developer.mozilla.org/en-US/docs/Glossary/HTTPS_RR)
    245. [Hyperlink](https://developer.mozilla.org/en-US/docs/Glossary/Hyperlink)
    246. [Hypertext](https://developer.mozilla.org/en-US/docs/Glossary/Hypertext)
    247. [IANA](https://developer.mozilla.org/en-US/docs/Glossary/IANA)
    248. [ICANN](https://developer.mozilla.org/en-US/docs/Glossary/ICANN)
    249. [ICE](https://developer.mozilla.org/en-US/docs/Glossary/ICE)
    250. [IDE](https://developer.mozilla.org/en-US/docs/Glossary/IDE)
    251. [Idempotent](https://developer.mozilla.org/en-US/docs/Glossary/Idempotent)
    252. [Identifier](https://developer.mozilla.org/en-US/docs/Glossary/Identifier)
    253. [Identity provider (IdP)](https://developer.mozilla.org/en-US/docs/Glossary/Identity_provider)
    254. [IDL](https://developer.mozilla.org/en-US/docs/Glossary/IDL)
    255. [IETF](https://developer.mozilla.org/en-US/docs/Glossary/IETF)
    256. [IIFE](https://developer.mozilla.org/en-US/docs/Glossary/IIFE)
    257. [IMAP](https://developer.mozilla.org/en-US/docs/Glossary/IMAP)
    258. [Immutable](https://developer.mozilla.org/en-US/docs/Glossary/Immutable)
    259. [IndexedDB](https://developer.mozilla.org/en-US/docs/Glossary/IndexedDB)
    260. [Information architecture](https://developer.mozilla.org/en-US/docs/Glossary/Information_architecture)
    261. [Inheritance](https://developer.mozilla.org/en-US/docs/Glossary/Inheritance)
    262. [Ink overflow](https://developer.mozilla.org/en-US/docs/Glossary/Ink_overflow)
    263. [Inline-level content](https://developer.mozilla.org/en-US/docs/Glossary/Inline-level_content)
    264. [Input method editor](https://developer.mozilla.org/en-US/docs/Glossary/Input_method_editor)
    265. [Inset properties](https://developer.mozilla.org/en-US/docs/Glossary/Inset_properties)
    266. [Instance](https://developer.mozilla.org/en-US/docs/Glossary/Instance)
    267. [Interaction to Next Paint (INP)](https://developer.mozilla.org/en-US/docs/Glossary/Interaction_to_next_paint)
    268. [Internationalization (i18n)](https://developer.mozilla.org/en-US/docs/Glossary/Internationalization)
    269. [Internet](https://developer.mozilla.org/en-US/docs/Glossary/Internet)
    270. [Interpolation](https://developer.mozilla.org/en-US/docs/Glossary/Interpolation)
    271. [Intrinsic size](https://developer.mozilla.org/en-US/docs/Glossary/Intrinsic_Size)
    272. [Invariant](https://developer.mozilla.org/en-US/docs/Glossary/Invariant)
    273. [IP Address](https://developer.mozilla.org/en-US/docs/Glossary/IP_Address)
    274. [IPv4](https://developer.mozilla.org/en-US/docs/Glossary/IPv4)
    275. [IPv6](https://developer.mozilla.org/en-US/docs/Glossary/IPv6)
    276. [IRC](https://developer.mozilla.org/en-US/docs/Glossary/IRC)
    277. [ISO](https://developer.mozilla.org/en-US/docs/Glossary/ISO)
    278. [ISP](https://developer.mozilla.org/en-US/docs/Glossary/ISP)
    279. [ITU](https://developer.mozilla.org/en-US/docs/Glossary/ITU)
    280. [Jank](https://developer.mozilla.org/en-US/docs/Glossary/Jank)
    281. [Java](https://developer.mozilla.org/en-US/docs/Glossary/Java)
    282. [JavaScript](https://developer.mozilla.org/en-US/docs/Glossary/JavaScript)
    283. [Jitter](https://developer.mozilla.org/en-US/docs/Glossary/Jitter)
    284. [JPEG](https://developer.mozilla.org/en-US/docs/Glossary/JPEG)
    285. [JSON](https://developer.mozilla.org/en-US/docs/Glossary/JSON)
    286. [JSON type representation](https://developer.mozilla.org/en-US/docs/Glossary/JSON_type_representation)
    287. [Just-In-Time Compilation (JIT)](https://developer.mozilla.org/en-US/docs/Glossary/Just_In_Time_Compilation)
    288. [Kebab case](https://developer.mozilla.org/en-US/docs/Glossary/Kebab_case)
    289. [Key](https://developer.mozilla.org/en-US/docs/Glossary/Key)
    290. [Keyword](https://developer.mozilla.org/en-US/docs/Glossary/Keyword)
    291. [Largest Contentful Paint (LCP)](https://developer.mozilla.org/en-US/docs/Glossary/Largest_contentful_paint)
    292. [Latency](https://developer.mozilla.org/en-US/docs/Glossary/Latency)
    293. [Layout mode](https://developer.mozilla.org/en-US/docs/Glossary/Layout_mode)
    294. [Layout viewport](https://developer.mozilla.org/en-US/docs/Glossary/Layout_viewport)
    295. [Lazy load](https://developer.mozilla.org/en-US/docs/Glossary/Lazy_load)
    296. [Leading](https://developer.mozilla.org/en-US/docs/Glossary/Leading)
    297. [LGPL](https://developer.mozilla.org/en-US/docs/Glossary/LGPL)
    298. [Ligature](https://developer.mozilla.org/en-US/docs/Glossary/Ligature)
    299. [Literal](https://developer.mozilla.org/en-US/docs/Glossary/Literal)
    300. [Local scope](https://developer.mozilla.org/en-US/docs/Glossary/Local_scope)
    301. [Local variable](https://developer.mozilla.org/en-US/docs/Glossary/Local_variable)
    302. [Locale](https://developer.mozilla.org/en-US/docs/Glossary/Locale)
    303. [Localization](https://developer.mozilla.org/en-US/docs/Glossary/Localization)
    304. [Logical properties](https://developer.mozilla.org/en-US/docs/Glossary/Logical_properties)
    305. [Long task](https://developer.mozilla.org/en-US/docs/Glossary/Long_task)
    306. [Loop](https://developer.mozilla.org/en-US/docs/Glossary/Loop)
    307. [Lossless compression](https://developer.mozilla.org/en-US/docs/Glossary/Lossless_compression)
    308. [Lossy compression](https://developer.mozilla.org/en-US/docs/Glossary/Lossy_compression)
    309. [LTR (Left To Right)](https://developer.mozilla.org/en-US/docs/Glossary/LTR)
    310. [Main axis](https://developer.mozilla.org/en-US/docs/Glossary/Main_Axis)
    311. [Main thread](https://developer.mozilla.org/en-US/docs/Glossary/Main_thread)
    312. [Markup](https://developer.mozilla.org/en-US/docs/Glossary/Markup)
    313. [MathML](https://developer.mozilla.org/en-US/docs/Glossary/MathML)
    314. [Media](https://developer.mozilla.org/en-US/docs/Glossary/Media)
      1. [Media (Audio-visual presentation)](https://developer.mozilla.org/en-US/docs/Glossary/Media/Audio-visual_presentation)
      2. [Media (CSS)](https://developer.mozilla.org/en-US/docs/Glossary/Media/CSS)
    315. [Media query](https://developer.mozilla.org/en-US/docs/Glossary/Media_query)
    316. [Metadata](https://developer.mozilla.org/en-US/docs/Glossary/Metadata)
    317. [Method](https://developer.mozilla.org/en-US/docs/Glossary/Method)
    318. [Microsoft Edge](https://developer.mozilla.org/en-US/docs/Glossary/Microsoft_Edge)
    319. [Microsoft Internet Explorer](https://developer.mozilla.org/en-US/docs/Glossary/Microsoft_Internet_Explorer)
    320. [Middleware](https://developer.mozilla.org/en-US/docs/Glossary/Middleware)
    321. [MIME](https://developer.mozilla.org/en-US/docs/Glossary/MIME)
    322. [MIME type](https://developer.mozilla.org/en-US/docs/Glossary/MIME_type)
    323. [Minification](https://developer.mozilla.org/en-US/docs/Glossary/Minification)
    324. [MitM](https://developer.mozilla.org/en-US/docs/Glossary/MitM)
    325. [Mixin](https://developer.mozilla.org/en-US/docs/Glossary/Mixin)
    326. [Mobile first](https://developer.mozilla.org/en-US/docs/Glossary/Mobile_First)
    327. [Modem](https://developer.mozilla.org/en-US/docs/Glossary/Modem)
    328. [Modularity](https://developer.mozilla.org/en-US/docs/Glossary/Modularity)
    329. [Mozilla Firefox](https://developer.mozilla.org/en-US/docs/Glossary/Mozilla_Firefox)
    330. [Multi-factor authentication](https://developer.mozilla.org/en-US/docs/Glossary/Multi-factor_authentication)
    331. [Mutable](https://developer.mozilla.org/en-US/docs/Glossary/Mutable)
    332. [MVC](https://developer.mozilla.org/en-US/docs/Glossary/MVC)
    333. [Namespace](https://developer.mozilla.org/en-US/docs/Glossary/Namespace)
    334. [NaN](https://developer.mozilla.org/en-US/docs/Glossary/NaN)
    335. [NAT](https://developer.mozilla.org/en-US/docs/Glossary/NAT)
    336. [Native](https://developer.mozilla.org/en-US/docs/Glossary/Native)
    337. [Navigation directive](https://developer.mozilla.org/en-US/docs/Glossary/Navigation_directive)
    338. [Netscape Navigator](https://developer.mozilla.org/en-US/docs/Glossary/Netscape_Navigator)
    339. [Network throttling](https://developer.mozilla.org/en-US/docs/Glossary/Network_throttling)
    340. [NNTP](https://developer.mozilla.org/en-US/docs/Glossary/NNTP)
    341. [Node](https://developer.mozilla.org/en-US/docs/Glossary/Node)
      1. [Node (DOM)](https://developer.mozilla.org/en-US/docs/Glossary/Node/DOM)
      2. [Node (networking)](https://developer.mozilla.org/en-US/docs/Glossary/Node/networking)
    342. [Node.js](https://developer.mozilla.org/en-US/docs/Glossary/Node.js)
    343. [Non-normative](https://developer.mozilla.org/en-US/docs/Glossary/Non-normative)
    344. [Nonce](https://developer.mozilla.org/en-US/docs/Glossary/Nonce)
    345. [Normative](https://developer.mozilla.org/en-US/docs/Glossary/Normative)
    346. [Null](https://developer.mozilla.org/en-US/docs/Glossary/Null)
    347. [Nullish value](https://developer.mozilla.org/en-US/docs/Glossary/Nullish)
    348. [Number](https://developer.mozilla.org/en-US/docs/Glossary/Number)
    349. [Object](https://developer.mozilla.org/en-US/docs/Glossary/Object)
    350. [Object reference](https://developer.mozilla.org/en-US/docs/Glossary/Object_reference)
    351. [OOP](https://developer.mozilla.org/en-US/docs/Glossary/OOP)
    352. [OpenGL](https://developer.mozilla.org/en-US/docs/Glossary/OpenGL)
    353. [OpenSSL](https://developer.mozilla.org/en-US/docs/Glossary/OpenSSL)
    354. [Opera browser](https://developer.mozilla.org/en-US/docs/Glossary/Opera_Browser)
    355. [Operand](https://developer.mozilla.org/en-US/docs/Glossary/Operand)
    356. [Operator](https://developer.mozilla.org/en-US/docs/Glossary/Operator)
    357. [Origin](https://developer.mozilla.org/en-US/docs/Glossary/Origin)
    358. [OTA](https://developer.mozilla.org/en-US/docs/Glossary/OTA)
    359. [OWASP](https://developer.mozilla.org/en-US/docs/Glossary/OWASP)
    360. [P2P](https://developer.mozilla.org/en-US/docs/Glossary/P2P)
    361. [PAC](https://developer.mozilla.org/en-US/docs/Glossary/PAC)
    362. [Packet](https://developer.mozilla.org/en-US/docs/Glossary/Packet)
    363. [Page load time](https://developer.mozilla.org/en-US/docs/Glossary/Page_load_time)
    364. [Page prediction](https://developer.mozilla.org/en-US/docs/Glossary/Page_prediction)
    365. [Parameter](https://developer.mozilla.org/en-US/docs/Glossary/Parameter)
    366. [Parent object](https://developer.mozilla.org/en-US/docs/Glossary/Parent_object)
    367. [Parse](https://developer.mozilla.org/en-US/docs/Glossary/Parse)
    368. [Parser](https://developer.mozilla.org/en-US/docs/Glossary/Parser)
    369. [Payload body](https://developer.mozilla.org/en-US/docs/Glossary/Payload_body)
    370. [Payload header](https://developer.mozilla.org/en-US/docs/Glossary/Payload_header)
    371. [PDF](https://developer.mozilla.org/en-US/docs/Glossary/PDF)
    372. [Perceived performance](https://developer.mozilla.org/en-US/docs/Glossary/Perceived_performance)
    373. [Percent-encoding](https://developer.mozilla.org/en-US/docs/Glossary/Percent-encoding)
    374. [PHP](https://developer.mozilla.org/en-US/docs/Glossary/PHP)
    375. [Physical properties](https://developer.mozilla.org/en-US/docs/Glossary/Physical_properties)
    376. [Pixel](https://developer.mozilla.org/en-US/docs/Glossary/Pixel)
    377. [Placeholder names](https://developer.mozilla.org/en-US/docs/Glossary/Placeholder_names)
    378. [Plaintext](https://developer.mozilla.org/en-US/docs/Glossary/Plaintext)
    379. [Plugin](https://developer.mozilla.org/en-US/docs/Glossary/Plugin)
    380. [PNG](https://developer.mozilla.org/en-US/docs/Glossary/PNG)
    381. [Polyfill](https://developer.mozilla.org/en-US/docs/Glossary/Polyfill)
    382. [Polymorphism](https://developer.mozilla.org/en-US/docs/Glossary/Polymorphism)
    383. [POP3](https://developer.mozilla.org/en-US/docs/Glossary/POP)
    384. [Port](https://developer.mozilla.org/en-US/docs/Glossary/Port)
    385. [Prefetch](https://developer.mozilla.org/en-US/docs/Glossary/Prefetch)
    386. [Preflight request](https://developer.mozilla.org/en-US/docs/Glossary/Preflight_request)
    387. [Prerender](https://developer.mozilla.org/en-US/docs/Glossary/Prerender)
    388. [Presto](https://developer.mozilla.org/en-US/docs/Glossary/Presto)
    389. [Primitive](https://developer.mozilla.org/en-US/docs/Glossary/Primitive)
    390. [Principle of least privilege](https://developer.mozilla.org/en-US/docs/Glossary/Principle_of_least_privilege)
    391. [Privileged](https://developer.mozilla.org/en-US/docs/Glossary/Privileged)
    392. [Privileged code](https://developer.mozilla.org/en-US/docs/Glossary/Privileged_code)
    393. [Progressive enhancement](https://developer.mozilla.org/en-US/docs/Glossary/Progressive_Enhancement)
    394. [Progressive web applications (PWAs)](https://developer.mozilla.org/en-US/docs/Glossary/Progressive_web_apps)
    395. [Promise](https://developer.mozilla.org/en-US/docs/Glossary/Promise)
    396. [Property](https://developer.mozilla.org/en-US/docs/Glossary/Property)
      1. [Property (CSS)](https://developer.mozilla.org/en-US/docs/Glossary/Property/CSS)
      2. [Property (JavaScript)](https://developer.mozilla.org/en-US/docs/Glossary/Property/JavaScript)
    397. [Protocol](https://developer.mozilla.org/en-US/docs/Glossary/Protocol)
    398. [Prototype](https://developer.mozilla.org/en-US/docs/Glossary/Prototype)
    399. [Prototype-based programming](https://developer.mozilla.org/en-US/docs/Glossary/Prototype-based_programming)
    400. [Proxy server](https://developer.mozilla.org/en-US/docs/Glossary/Proxy_server)
    401. [Pseudo-class](https://developer.mozilla.org/en-US/docs/Glossary/Pseudo-class)
    402. [Pseudo-element](https://developer.mozilla.org/en-US/docs/Glossary/Pseudo-element)
    403. [Pseudocode](https://developer.mozilla.org/en-US/docs/Glossary/Pseudocode)
    404. [Public-key cryptography](https://developer.mozilla.org/en-US/docs/Glossary/Public-key_cryptography)
    405. [Python](https://developer.mozilla.org/en-US/docs/Glossary/Python)
    406. [Quality values](https://developer.mozilla.org/en-US/docs/Glossary/Quality_values)
    407. [Quaternion](https://developer.mozilla.org/en-US/docs/Glossary/Quaternion)
    408. [QUIC](https://developer.mozilla.org/en-US/docs/Glossary/QUIC)
    409. [RAIL](https://developer.mozilla.org/en-US/docs/Glossary/RAIL)
    410. [Random Number Generator](https://developer.mozilla.org/en-US/docs/Glossary/RNG)
    411. [Raster image](https://developer.mozilla.org/en-US/docs/Glossary/Raster_image)
    412. [Rate limit](https://developer.mozilla.org/en-US/docs/Glossary/Rate_limit)
    413. [RDF](https://developer.mozilla.org/en-US/docs/Glossary/RDF)
    414. [Reading order](https://developer.mozilla.org/en-US/docs/Glossary/Reading_order)
    415. [Real User Monitoring (RUM)](https://developer.mozilla.org/en-US/docs/Glossary/Real_User_Monitoring)
    416. [Recursion](https://developer.mozilla.org/en-US/docs/Glossary/Recursion)
    417. [Reflow](https://developer.mozilla.org/en-US/docs/Glossary/Reflow)
    418. [Registrable domain](https://developer.mozilla.org/en-US/docs/Glossary/Registrable_domain)
    419. [Regular expression](https://developer.mozilla.org/en-US/docs/Glossary/Regular_expression)
    420.