Our experimental CSS Masks implementation has been improved:.Implemented grid item baseline content alignment ( bug 1256429).Implemented grid layout support for align, justify-self :baseline and last-baseline (aka "baseline self-alignment") ( bug 1221525).Implemented for the grid-gap, grid-row-gap, and grid-column-gap properties ( bug 1266268).Our experimental CSS Grids implementation has been improved:.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).Added support for the and elements ( bug 1226455).The Storage Inspector now allows IndexedDB databases to be deleted via their own context menus ( bug 1205123), and will display warning messages if the IndexedDB cannot be deleted for some reason (if there are still active connections, for example) ( bug 1268460).The Disable Cache option in the Toolbox Advanced settings has been renamed to Disable HTTP Cache, to make it clearer that this affects the HTTP cache, and not Service Workers/the Cache API (bug(1253018)).about:debugging now has a new Tabs page available, which provides a complete list of all the debuggable tabs open in the current Firefox instance ( bug 1266128).In the about:debugging Workers page, a warning message will be displayed in the Service Workers section if service workers are incompatible with the current browser configuration ( bug 1266415).It will be disabled for all other add-ons ( bug 1273184). In the about:debugging Add-ons page, the Reload button is only enabled for temporary add-ons.The Network Monitor now shows a Cause column, which provides an indication of what caused each particular network request ( bug 1134073).Added proper tree view semantics and keyboard navigation to the Inspector's markup view ( bug 1242694).
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