Added support for overflow-wrap, replacing word-wrap that is still supported as an alternative name ( bug 955857).The property text-align-last has been unprefixed ( bug 1039541).Added the q length unit ( bug 1274526).In our experimental implementation (not yet activated by default) of clip-path, we can now interpolate between values ( bug 1110460).The pseudo-class :dir has been unprefixed ( bug 859301).Added support for specifying colors with an alpha channel using 4- and 8-digit CSS hex color values (#RRGGBBAA and #RGBA) ( bug 567283).On background-clip, the keyword text is now activated by default ( bug 1264905).Added support for the round and space keywords to background-repeat ( bug 548372).Added background-position-x and background-position-y, which allow separately specifying the horizontal and vertical offsets at which to draw a background image these are components of background-position ( bug 550426).The HTMLLabelElement.form property still exists, but now returns the form with which the label's control is associated, if there is a control (and if that control is associated with a form) ( bug 1268852). The form content attribute of the element has been removed.The referrerpolicy attribute on the element now supports the 'no-referrer-when-downgrade' and 'origin-when-cross-origin' ( bug 1178337).Support for microdata attributes and the Microdata API have been removed ( bug 909633).The element's sandbox attribute now supports the 'allow-popups-to-escape-sandbox' and 'allow-modals' values ( bug 1190641).To match a spec change, an invalid value of the kind attribute of the element is now treated like "metadata" instead of "subtitles" ( bug 1269712).The pattern attribute of the element now uses the 'u' parameter in the underlying JavaScript RegExp ( bug 1227906).
The Animation Inspector now exposes animation performance information in DevTools ( bug 1254408).CSS autocomplete: show more suggestions in autocomplete popup ( bug 1260419).JavaScript errors logged into the console now provide a link for additional debugging help ( bug 1179876).