Intent to Implement: CSS text-decoration-width

Summary: text-decoration-width allows web developers to specify a specific 
thickness of an underline, overline, or line-through text-decoration. This 
allows web developers to have greater control over the look and style of their 
web pages.

Bug: https://bugzilla.mozilla.org/show_bug.cgi?id=1440014 
<https://bugzilla.mozilla.org/show_bug.cgi?id=1552062>

Spec: https://drafts.csswg.org/css-text-decor-4/#text-decoration-width-property 
<https://drafts.csswg.org/css-text-decor-4/#underline-offset>

Platform coverage: All platforms using gecko rendering engine

Estimated release to mozilla-central: next 1-2 weeks

Preference behind which this will be implemented:
layout.css.text-decoration-width.enabled

Is this feature enabled by default in sandboxed frames? Yes

DevTools bug: None needed

Support in other browsers: Safari Technology Preview is the only other browser 
supporting this feature

Web-platform-tests: 
        - parsing tests: 
https://searchfox.org/mozilla-central/source/testing/web-platform/tests/css/css-text-decor
 
<https://searchfox.org/mozilla-central/source/testing/web-platform/tests/css/css-text-decor>
 
                - text-decoration-width-* tests
        - Ref tests: https://bugzilla.mozilla.org/show_bug.cgi?id=1558899

- Charlie Marlow
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