Add external <script type=speculationrules>

[vickiez]

Add external <script type="speculationrules">

Allows a speculation rules script element to have a src pointing to a
file of speculation rules, enabling developers to easily reuse a set of
speculation rules across HTML documents.

WICG/nav-speculation#348

Spec changes:

• Add a row for external speculation rules in the attributes table of
  4.12.1 The script element

• During prepare the script element, handle the case where src
  content attribute is present and type is "speculationrules"

• Define a "fetch speculation rules" algorithm to be used by both the
  external script and 7.6.3 The Speculation-Rules header sections.

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• At least two implementers are interested (and none opposed):
  • …
  • …
• Tests are written and can be reviewed and commented upon at:
  • …
• Implementation bugs are filed:
  • Chromium: …
  • Gecko: …
  • WebKit: …
  • Deno (only for timers, structured clone, base64 utils, channel messaging, module resolution, web workers, and web storage): …
  • Node.js (only for timers, structured clone, base64 utils, channel messaging, and module resolution): …
• Corresponding HTML AAM & ARIA in HTML issues & PRs:
• MDN issue is filed: …
• 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 )
/speculative-loading.html ( diff )
/webappapis.html ( diff )