60cb3d6db9
Remove the browser-prefixed placeholder styling `-ms-input-placeholder` and custom opacity for `-moz-placeholder`. `--ms-input-placeholder` is no longer used by any supported browsers and Firefox now uses `color-mix` to set placeholder colors instead of reduced opacity. Props afercia, abcd95, sabernhardt, aialvi, joedolson. Fixes #63030. Built from https://develop.svn.wordpress.org/trunk@60636 git-svn-id: http://core.svn.wordpress.org/trunk@59972 1a063a9b-81f0-0310-95a4-ce76da25c4cd