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Currently, Gecko does not support updating `font-size` style even in the CSS mode. Therefore, `CSSEditUtils` claims that `<font size="...">` style is not CSS editable. Supporting it requires a lot of new code but currently we don't have any reports about this poor support. Therefore, we should only try to make the style editor remove `font-size` properties around selection at setting `<font size="...">` style for now. Additionally, Blink and WebKit does not allow to nest multiple `<font>` elements and `<span>` elements which specify `font-size`, `font-family` or `color`. When setting one of the styles, they split ancestors which are related to the style at range boundaries. Then, unwrap the unnecessary elements. This makes the DOM tree simpler, thus, the later handling will be simpler. Therefore, it's worthwhile to follow them. Unfortunately, there are some logic differences when handling styles in elements having `id` attribute. Therefore, there are some new test failures, but I guess that it does not cause any problems in web apps in the wild because it's hard to manage editable identified elements in cross browsers and I have no idea of motivations to do it. Depends on D166617 Differential Revision: https://phabricator.services.mozilla.com/D167011