Redeclaration of let and const variables now throws a Synta圎rror instead of a TypeError as per the ECMAScript specification ( bug 1198833).
To use this experimental API set _memory to true in about:config. See the SharedArrayBuffer and Atomics objects.
The experimental EcmaScript Shared Memory API has been implemented.
The ES2015 () method has been implemented ( bug 1121937).
The ES2015 block-level functions have been implemented ( bug 1071646).
The ES2015 RegExp unicode (u) flag has been implemented ( bug 1135377).
"unsafe start" (formerly "true start") should serialize to "start" etc ( bug 1230398).
Added -webkit-filter for web compatibility, behind the preference, defaulting to false ( bug 1236506).
linear-gradient() support for the omission of 0deg units ( bug 1239153).
Added support for (-webkit-transform-3d) as a media query for 3D transform support, if about:config pref is set to true ( bug 1239799).
The experimental support of the font-display descriptor (of it requires to switch to true ( bug 1157064).
Gecko now accepts the -webkit- prefixed version of some properties it requires to switch to true ( bug 1213126).
The properties text-emphasis, text-emphasis-style, text-emphasis-color and text-emphasis-position are now enabled by default ( bug 1231485).
The true value has been renamed to unsafe this affects the properties justify-content, align-content, justify-self, align-self, justify-items and align-items ( bug 1230478).
The keywords auto-fill and auto-fit are now allowed in the repeat() function ( bug 1118820).
Our implementation of CSS Grids has been updated:.
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