[wp-trac] [WordPress Trac] #49360: Scripts: Add polyfill for window.URL

[WordPress Trac]

#49360: Scripts: Add polyfill for window.URL
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 Reporter:  aduth          |      Owner:  (none)
     Type:  enhancement    |     Status:  new
 Priority:  normal         |  Milestone:  Awaiting Review
Component:  Script Loader  |    Version:
 Severity:  normal         |   Keywords:
  Focuses:  javascript     |
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 Related Gutenberg pull request:
 https://github.com/WordPress/gutenberg/pull/19871

 Gutenberg code planned to be included as part of the upcoming WordPress
 5.4 will make use of the [https://developer.mozilla.org/en-
 US/docs/Web/API/URL `URL` global constructor]. This is not supported in
 Internet Explorer 11, but a polyfill exists. Following the existing
 patterns of polyfills in the script loader, the accompanying patch
 proposes to add the polyfill for `window.URL`. It is able to reuse the
 `polyfill-library` dependency used for the `Node#contains` polyfill, so no
 new dependencies are required.

 Once the patch is applied, it can be verified by building the project and
 visiting the Posts > New Post editor page. Viewing page source, you should
 see a polyfill inline script when searching the `window.URL` key phrase.
 You can further verify that when loading the editor in Internet Explorer
 11, you should be able to see that `window.URL` exists using the
 [https://docs.microsoft.com/en-us/previous-
 versions/windows/desktop/legacy/hh968260(v%3Dvs.85) F12 Tools Console].

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Ticket URL: <https://core.trac.wordpress.org/ticket/49360>
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