ryelle e32d9ec522 Toolbar: Provide a CSS custom property for the admin bar height.
This new custom property, `--wp-admin--admin-bar--height`, reflects the admin bar's height and adjusts responsively on smaller screens. It can be used to offset content to avoid overlapping the admin bar, without needing to copy the media query.

This also removes a workaround only needed for Internet Explorer 6 and below.

Props nico23, sabernhardt.
Fixes #52623.


Built from https://develop.svn.wordpress.org/trunk@51672


git-svn-id: http://core.svn.wordpress.org/trunk@51278 1a063a9b-81f0-0310-95a4-ce76da25c4cd
2021-08-26 18:24:58 +00:00
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