Compatibility/Mobile/Non Standard Compatibility
Meta tracking bug for all issues here: 1170774
Non-standard APIs and Properties required for Web Compatibility
This page contains a list of CSS and DOM properties & APIs required for compatibility with the de-facto (mobile) web.
Each is grouped into a group of relative priority, as perceived by the Web Compat team (based on known issues in Bugzilla and webcompat.com and other investigations).
Parts of this list will eventually make its way into the Compatibility Standard.
This document of WebKit stuff implemented in Microsoft Edge also serves as a guide, though not everything will be as important for Gecko.
CSS Features
Tracker bug for CSS changes: 1170789
Highest Priority
- Enable CSS Unprefixing Service globally. 1177263
The rest of the properties below could be added to the CSS Unprefixing Service, or aliased natively, depending on what makes the most sense.
Any properties that are aliased or rewritten in CSS should also be available via the CSSOM.
High Priority
- -webkit-flexbox (implemented currently by 1107378)
- -webkit-background* 1179386
- -webkit- prefixed gradients 1210575
- -webkit-transforms 1179444
- -webkit-transitions 1179437
Medium Priority
- -webkit-appearance (or at least -moz-appearance to behave in the same way 605985)
- -background-position-x/y 550426
Lower Priority
- -webkit-device-pixel-ratio 1176968
- -webkit-animation 1179408
- -webkit-border* 1179393
- -webkit-column* 1179406
Super Hard but would fix many cosmetic issues (maybe create more?)
- max-width 100% inside of table (975632 + blockers/dependencies, related, etc). In the process of trying to understand this bug, I went on a journey to graph the dependencies.
DOM APIs
Tracker bug for DOM changes: 1170774
High Priority
Medium Priority
Low Priority
- Make any CSSUnprefixingService-backed properties available via the DOM 1181624 (we need to gather bugs that would be fixed by having this).