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The other browsers use any inline elements to set CSS property for applying
an inline style. However, Gecko limits it to a `<span>` which does not have
any attributes. The other browsers' design is better for saving number of
elements and runtime cost of inserting new element (moving all children to the
new element and inserting it to the original position). Therefore, it's nicer
to follow the other browses. Then, we can avoid new WPT failures at aligning
other behaviors to the other browsers.
With doing that, removing style code requires complicated changes because
`RemoveStyleInside` assumes that one element has one style, but after taking
the compatible behavior, one element can have multiple styles including the
style represented by the element itself.
Note that the new expected failures are caused by bug 1183844. Gecko returns
closest ancestor element's background color for
`queryCommandValue("backColor")`. Therefore, it returns "transparent" of the
inner `<span>` element.
Differential Revision: https://phabricator.services.mozilla.com/D164004
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