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  1. MDN Web Docs Glossary: Definitions of Web-related terms
  2. CSS pixel
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In this article

  • See also
  1. Glossary
    1. Abstraction
    2. Accent
    3. Accessibility
    4. Accessibility tree
    5. Accessible description
    6. Accessible name
    7. Adobe Flash
    8. Advance measure
    9. Ajax
    10. Algorithm
    11. Alignment container
    12. Alignment subject
    13. Alpha (alpha channel)
    14. ALPN
    15. API
    16. Apple Safari
    17. Application Context
    18. Argument
    19. ARIA
    20. ARPA
    21. ARPANET
    22. Array
    23. ASCII
    24. Aspect ratio
    25. Asynchronous
    26. ATAG
    27. Attribute
    28. Bandwidth
    29. Base64
    30. Baseline
    31. Beacon
    32. Bézier curve
    33. bfcache
    34. BiDi
    35. BigInt
    36. Binding
    37. Bitwise flags
    38. Blink
    39. Block
    40. Block cipher mode of operation
    41. Block-level content
    42. Boolean
    43. Bounding Box
    44. Breadcrumb
    45. Brotli compression
    46. Browser
    47. Browsing context
    48. Buffer
    49. Cache
    50. Cacheable
    51. CalDAV
    52. Call stack
    53. Callback function
    54. Camel case
    55. Canonical order
    56. Canvas
    57. Card sorting
    58. CardDAV
    59. Caret
    60. CDN
    61. Certificate authority
    62. Certified
    63. Challenge-response authentication
    64. Character
    65. Character encoding
    66. Character set
    67. Chrome
    68. CIA
    69. Cipher
    70. Cipher suite
    71. Ciphertext
    72. Class
    73. Clickjacking
    74. Closure
    75. CMS
    76. Code point
    77. Code splitting
    78. Code unit
    79. Codec
    80. Color space
    81. Color wheel
    82. Compile
    83. Compile time
    84. Composite operation
    85. Computer Programming
    86. Conditional
    87. Constant
    88. Constructor
    89. Continuous Media
    90. Control flow
    91. Cookie
    92. Copyleft
    93. CORS
    94. CORS-safelisted request header
    95. CORS-safelisted response header
    96. Crawler
    97. CRLF
    98. Cross Axis
    99. Cross-site scripting (XSS)
    100. CRUD
    101. Cryptanalysis
    102. Cryptographic hash function
    103. Cryptography
    104. CSP
    105. CSRF
    106. CSS
    107. CSS Object Model (CSSOM)
    108. CSS pixel
    109. CSS preprocessor
    110. Data structure
    111. Database
    112. Decryption
    113. Deep copy
    114. Delta
    115. Denial of Service
    116. Deno
    117. Descriptor (CSS)
    118. Deserialization
    119. Developer Tools
    120. Digest
    121. Digital certificate
    122. Distributed Denial of Service
    123. DMZ
    124. DNS
    125. Doctype
    126. Document directive
    127. Document environment
    128. DOM (Document Object Model)
    129. Domain
    130. Domain name
    131. Domain sharding
    132. Dominator
    133. DoS attack
    134. DSL
    135. DTLS (Datagram Transport Layer Security)
    136. DTMF (Dual-Tone Multi-Frequency signaling)
    137. Dynamic typing
    138. ECMA
    139. ECMAScript
    140. Effective connection type
    141. Element
    142. Encapsulation
    143. Encryption
    144. Endianness
    145. Engine
    146. Entity
    147. Entity header
    148. Enumerated
    149. eTLD
    150. Event
    151. Exception
    152. EXIF
    153. Expando
    154. Fallback alignment
    155. Falsy
    156. Favicon
    157. Fetch directive
    158. Fetch metadata request header
    159. Fingerprinting
    160. Firefox OS
    161. Firewall
    162. First contentful paint
    163. First CPU idle
    164. First input delay
    165. First Meaningful Paint
    166. First paint
    167. First-class Function
    168. Flex
    169. Flex Container
    170. Flex Item
    171. Flexbox
    172. Forbidden header name
    173. Forbidden response header name
    174. Fork
    175. Fragmentainer
    176. Frame rate (FPS)
    177. FTP
    178. FTU
    179. Function
    180. Fuzz testing
    181. Gamut
    182. Garbage collection
    183. Gecko
    184. General header
    185. GIF
    186. Git
    187. Global object
    188. Global scope
    189. Global variable
    190. Glyph
    191. Google Chrome
    192. GPL
    193. GPU
    194. Graceful degradation
    195. Grid
    196. Grid Areas
    197. Grid Axis
    198. Grid Cell
    199. Grid Column
    200. Grid container
    201. Grid Lines
    202. Grid Row
    203. Grid Tracks
    204. Guard
    205. Gutters
    206. GZip compression
    207. Hash
    208. Head
    209. High-level programming language
    210. HMAC
    211. Hoisting
    212. Host
    213. Hotlink
    214. Houdini
    215. HPKP
    216. HSTS
    217. HTML
    218. HTML5
    219. HTTP
    220. HTTP header
    221. HTTP/2
    222. HTTP/3
    223. HTTPS
    224. HTTPS RR
    225. Hyperlink
    226. Hypertext
    227. IANA
    228. ICANN
    229. ICE
    230. IDE
    231. Idempotent
    232. Identifier
    233. IDL
    234. IETF
    235. IIFE
    236. IMAP
    237. Immutable
    238. IndexedDB
    239. Information architecture
    240. Inheritance
    241. Ink overflow
    242. Inline-level content
    243. Input method editor
    244. Instance
    245. Internationalization (i18n)
    246. Internet
    247. Interpolation
    248. Intrinsic size
    249. IP Address
    250. IPv4
    251. IPv6
    252. IRC
    253. ISO
    254. ISP
    255. ITU
    256. Jank
    257. Java
    258. JavaScript
    259. JPEG
    260. JSON
    261. JSON type representation
    262. Kebab case
    263. Key
    264. Keyword
    265. Largest contentful paint
    266. Latency
    267. Layout viewport
    268. Lazy load
    269. LGPL
    270. Ligature
    271. Literal
    272. Local scope
    273. Local variable
    274. Locale
    275. Localization
    276. Long task
    277. Loop
    278. Lossless compression
    279. Lossy compression
    280. LTR (Left To Right)
    281. Main Axis
    282. Main thread
    283. Markup
    284. MathML
    285. Media
    286. Media query
    287. Metadata
    288. Method
    289. Microsoft Edge
    290. Microsoft Internet Explorer
    291. Middleware
    292. MIME
    293. MIME type
    294. Minification
    295. MitM
    296. Mixin
    297. Mobile First
    298. Modem
    299. Modularity
    300. Mozilla Firefox
    301. Mutable
    302. MVC
    303. Namespace
    304. NaN
    305. NAT
    306. Native
    307. Navigation directive
    308. Netscape Navigator
    309. Network throttling
    310. NNTP
    311. Node
    312. Node.js
    313. Non-normative
    314. Normative
    315. Null
    316. Nullish value
    317. Number
    318. Object
    319. Object reference
    320. OOP
    321. OpenGL
    322. OpenSSL
    323. Opera Browser
    324. Operand
    325. Operator
    326. Origin
    327. OTA
    328. OWASP
    329. P2P
    330. PAC
    331. Packet
    332. Page load time
    333. Page prediction
    334. Parameter
    335. Parent object
    336. Parse
    337. Parser
    338. Payload body
    339. Payload header
    340. PDF
    341. Perceived performance
    342. Percent-encoding
    343. PHP
    344. Pixel
    345. Placeholder names
    346. Plaintext
    347. Plugin
    348. PNG
    349. Polyfill
    350. Polymorphism
    351. POP3
    352. Port
    353. Prefetch
    354. Preflight request
    355. Prerender
    356. Presto
    357. Primitive
    358. Privileged
    359. Privileged code
    360. Progressive Enhancement
    361. Progressive web apps
    362. Promise
    363. Property
    364. Protocol
    365. Prototype
    366. Prototype-based programming
    367. Proxy server
    368. Pseudo-class
    369. Pseudo-element
    370. Pseudocode
    371. Public-key cryptography
    372. Python
    373. Quality values
    374. Quaternion
    375. QUIC
    376. RAIL
    377. Random Number Generator
    378. Raster image
    379. RDF
    380. Real User Monitoring (RUM)
    381. Recursion
    382. Reflow
    383. Regular expression
    384. Render-blocking
    385. Rendering engine
    386. Repaint
    387. Replay attack
    388. Repo
    389. Reporting directive
    390. Representation header
    391. Request header
    392. Resource Timing
    393. Response header
    394. Responsive web design
    395. REST
    396. RGB
    397. RIL
    398. Robots.txt
    399. Round Trip Time (RTT)
    400. Routers
    401. RSS
    402. Rsync
    403. RTCP (RTP Control Protocol)
    404. RTF
    405. RTL (Right to Left)
    406. RTP (Real-time Transport Protocol) and SRTP (Secure RTP)
    407. RTSP: Real-time streaming protocol
    408. Ruby
    409. Safe
    410. Same-origin policy
    411. SCM
    412. Scope
    413. Screen reader
    414. Script-supporting element
    415. Scroll boundary
    416. Scroll chaining
    417. Scroll container
    418. SCTP
    419. SDK (Software Development Kit)
    420. SDP
    421. Search engine
    422. Second-level Domain
    423. Secure Context
    424. Secure Sockets Layer (SSL)
    425. Selector (CSS)
    426. Self-Executing Anonymous Function
    427. Semantics
    428. SEO
    429. Serializable object
    430. Serialization
    431. Server
    432. Server Timing
    433. Session Hijacking
    434. SGML
    435. Shadow tree
    436. Shallow copy
    437. Shim
    438. Signature
    439. SIMD
    440. SISD
    441. Site
    442. Site map
    443. SLD
    444. Sloppy mode
    445. Slug
    446. Smoke Test
    447. SMPTE (Society of Motion Picture and Television Engineers)
    448. SMTP
    449. Snake case
    450. Snap positions
    451. SOAP
    452. SPA (Single-page application)
    453. Specification
    454. Speculative parsing
    455. Speed index
    456. SQL
    457. SQL Injection
    458. SRI
    459. Stacking context
    460. State machine
    461. Statement
    462. Static method
    463. Static typing
    464. Sticky activation
    465. Strict mode
    466. String
    467. Stringifier
    468. STUN
    469. Style origin
    470. Stylesheet
    471. Submit button
    472. SVG
    473. SVN
    474. Symbol
    475. Symmetric-key cryptography
    476. Synchronous
    477. Syntax
    478. Syntax error
    479. Synthetic monitoring
    480. Table Grid Box
    481. Table Wrapper Box
    482. Tag
    483. TCP
    484. TCP handshake
    485. TCP slow start
    486. Telnet
    487. Texel
    488. The Khronos Group
    489. Thread
    490. Three js
    491. Time to first byte
    492. Time to interactive
    493. TLD
    494. TOFU
    495. Top layer
    496. Transient activation
    497. Transport Layer Security (TLS)
    498. Tree shaking
    499. Trident
    500. Truthy
    501. TTL
    502. TURN
    503. Type
    504. Type coercion
    505. Type conversion
    506. TypeScript
    507. UDP (User Datagram Protocol)
    508. UI
    509. Undefined
    510. Unicode
    511. Unix time
    512. URI
    513. URL
    514. URN
    515. Usenet
    516. User agent
    517. UTF-8
    518. UUID
    519. UX
    520. Validator
    521. Value
    522. Variable
    523. Vendor Prefix
    524. Viewport
    525. Visual Viewport
    526. Void element
    527. VoIP
    528. W3C
    529. WAI
    530. WCAG
    531. Web performance
    532. Web server
    533. Web standards
    534. WebAssembly
    535. WebDAV
    536. WebExtensions
    537. WebGL
    538. WebIDL
    539. WebKit
    540. WebM
    541. WebP
    542. WebRTC
    543. WebSockets
    544. WebVTT
    545. WHATWG
    546. Whitespace
    547. WindowProxy
    548. World Wide Web
    549. Wrapper
    550. XForms Deprecated
    551. XHTML
    552. XInclude
    553. XLink
    554. XML
    555. XMLHttpRequest (XHR)
    556. XPath
    557. XQuery
    558. XSLT
    559. Zstandard compression

In this article

  • See also

CSS pixel

The term CSS pixel is synonymous with the CSS unit of absolute length px — which is normatively defined as being exactly 1/96th of 1 CSS inch (in).

See also

  • CSS Length Explained on the MDN Hacks Blog

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