Summary: CSS conic-gradients allow developers to specify gradients that
start from a certain angle where color stops are placed around the
circumference of a circle centered around a specified point.

Thanks to my friend Mohamed's work on Direct2D
<https://bugzilla.mozilla.org/show_bug.cgi?id=1617396>, full Windows
support is now available, so this can now be enabled by default everywhere.

Bug: https://bugzilla.mozilla.org/show_bug.cgi?id=conic-gradients

Standard: https://drafts.csswg.org/css-images-4/#conic-gradients

Target Release: 83

Platform coverage: All, but printing support will arrive after Cairo support
<https://bugzilla.mozilla.org/show_bug.cgi?id=1617039>.

Preference for feature: On by default (layout.css.conic-gradient.enabled)

DevTools bug:

   - Output parser support (angle/color swatches) was done in bug 1621794
   <https://bugzilla.mozilla.org/show_bug.cgi?id=1621794>
   - CSS autocomplete works
   - Prototype for a linear-gradient visualizer was done in bug 1364380
   <https://bugzilla.mozilla.org/show_bug.cgi?id=1364380> as pointed out by
   Patrick in the last email thread

Other browsers: shipped since Chrome 69, Safari 12.1, Edge 79 and Opera 64

web-platform-tests:
https://searchfox.org/mozilla-central/search?q=conic-gradient&case=false&regexp=false&path=testing%2Fweb-platform
Many parsing tests along with few rendering tests were already there,
although many were added at the beginning of the year in bug 1616986
<https://bugzilla.mozilla.org/show_bug.cgi?id=1616986>.

Restricted to secure contexts: No, CSS features are usually not restricted
to secure contexts

Is this feature enabled by default in sandboxed iframes? Yes
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