Use American English: "whilst" → "while", "fulfil" → "fulfill"

[husamemadH]

Description

Replaces the remaining British spelling variants in files/en-us with their American-English equivalents: whilst → while (10 occurrences) and fulfil → fulfill (1 occurrence).

Motivation

The writing style guide requires American-English spelling and states "Do not use variant spelling." These occurrences are inconsistent with the rest of the content:

Word	Files using it	Files using the American form
whilst	10	1541 (while)
fulfil	1	45 (fulfill)

cSpell doesn't flag either word because both are valid dictionary entries — they're British variants rather than misspellings — so these slipped through while npm run lint:typos stayed green.

The single fulfil is in MDN/Writing_guidelines/What_we_write, so this also makes the writing guidelines consistent with the spelling rule they document.

Additional details

Only prose was changed; no code samples, identifiers, or links were touched. Every replacement reads naturally in context ("occurred in the driver while processing", "While this is a useful feature", etc.).

Deliberate British spellings were intentionally left alone:

• the style guide's own "Incorrect: localise, behaviour, colour" examples
• jbond007@mi6.defence.gov.uk in the <input type="email"> examples
• the regular expressions guide, which uses "He asked his neighbour a favour." specifically to demonstrate matching British spellings
• references to the favourite-colour example, which is an actual repository name

Since while is shorter than whilst, no lines reflow under Prettier's proseWrap: "preserve".

Related issues and pull requests

None.

[github-actions]

Preview URLs (11 pages)

• /en-US/docs/Learn_web_development/Core/Accessibility/WAI-ARIA_basics
• /en-US/docs/Learn_web_development/Extensions/Client-side_tools/Deployment
• /en-US/docs/MDN/Writing_guidelines/What_we_write
• /en-US/docs/Web/API/Content_Index_API
• /en-US/docs/Web/API/FontFaceSet
• /en-US/docs/Web/API/Screen_Wake_Lock_API
• /en-US/docs/Web/API/Web_Periodic_Background_Synchronization_API
• /en-US/docs/Web/JavaScript/Reference/Global_Objects/String/at
• /en-US/docs/Web/JavaScript/Reference/Global_Objects/TypedArray/at
• /en-US/docs/Web/WebDriver/Reference/Errors/UnknownError
• /en-US/docs/Web/WebDriver/Reference/Errors

Flaws (36)

Note! 10 documents with no flaws that don't need to be listed. 🎉

Found an unexpected or unresolvable flaw? Please report it here.

URL: /en-US/docs/Web/WebDriver/Reference/Errors
Title: WebDriver errors
Flaw count: 36

• broken_links:
  • Link /en-US/docs/Web/WebDriver/Reference/Errors/UnexpectedAlertOpen doesn't resolve
  • Link /en-US/docs/Web/WebDriver/Reference/Errors/UnexpectedAlertOpen doesn't resolve
  • Link /en-US/docs/Web/WebDriver/Reference/Clients doesn't resolve
  • Link /en-US/docs/Web/WebDriver/Reference/Errors/ElementClickIntercepted doesn't resolve
  • Link /en-US/docs/Web/WebDriver/Reference/ElementClick doesn't resolve
  • and 31 more flaws omitted

External URLs (1)

URL: /en-US/docs/Learn_web_development/Core/Accessibility/WAI-ARIA_basics
Title: WAI-ARIA basics

• https://www.w3.org/WAI/ARIA/apg/ (1 time) (Note! This may be a new URL 👀)

(comment last updated: 2026-07-27 12:26:59)

[chrisdavidmills]

Looks good, thanks, @husamemadH!