Do not strip whitespace from non-classic script types

[annevk]

As in WebKit and Chromium, only strip leading and trailing ASCII whitespace from the type attribute value for the JavaScript MIME type check, so that, e.g., type=" module " is not a module script.

Fixes #13012. This is a follow-up to 36470c1.

• At least two implementers are interested (and none opposed):
  • Chromium
  • WebKit
• Tests are written and can be reviewed and commented upon at:
  • HTML: whitespace around non-classic script types web-platform-tests/wpt#63237
• Implementation bugs are filed:
  • Chromium: N/A
  • Gecko: https://bugzilla.mozilla.org/show_bug.cgi?id=2077692
  • WebKit: N/A
• Corresponding HTML AAM & ARIA in HTML issues & PRs: N/A
• MDN issue is filed: N/A
• The top of this comment includes a clear commit message to use.

(See WHATWG Working Mode: Changes for more details.)

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/scripting.html ( diff )

[emilio]

Looks sensible to me, can you file a Gecko bug to change this?