[re-sending, with a web-platform-tests link included - sorry!]
Summary: This property offers authors added control of the positioning
of underlines, primarily for vertical text (where conventions differ as
to whether an "underline" should appear to the left or right of the
text), and also for horizontal text where a lower underline may be
desirable (e.g. to avoid clashing with frequent subscript characters in
math or scientific content).
Bug: https://bugzilla.mozilla.org/show_bug.cgi?id=770780
Standard:
https://drafts.csswg.org/css-text-decor-3/#text-underline-position-property
Platform coverage: all
Preference: layout.css.text-underline-position.enabled
DevTools bug: n/a
Other browsers: Available in Chrome (& related browsers) since v.33,
according to https://caniuse.com/#search=text-underline-position; also
supported in IE/Edge.
web-platform-tests:
https://wpt.fyi/results/css/css-text-decor/parsing?label=master&q=text-underline-position
Secure contexts: Not restricted - this is a simple CSS property, not
restricted to secure contexts in existing browsers.
Is this feature enabled by default in sandboxed iframes? Yes.
If allowed, does it preserve the invariants in terms of what sandboxed
iframes can do? Yes.
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