https://drafts.csswg.org/css-text-decor-3/#text-underline-position-property
<rdar://problem/100311285>
Pull request: https://github.com/WebKit/WebKit/pull/30218
Alan implemented this behind a flag, if it's working maybe it should be moved from unstable to preview?
*** Bug 48936 has been marked as a duplicate of this bug. ***
*** Bug 112615 has been marked as a duplicate of this bug. ***
This is completed.