Several -webkit prefixed properties and values have been added for web compatibility, behind the preference, defaulting to false:.The text-emphasis, text-emphasis-style, text-emphasis-color, and text-emphasis-position have been implemented they are disabled by default (set to true to activate them ( Firefox bug 1040668).They are enabled by default on Nightly and Aurora (Dev edition), as well as on Firefox OS to activate it on a release or beta version, you need to flip the to true. The inline-start and inline-end values have been added to float and clear ( Firefox bug 1122918).Implement grid/flex layout for ( Firefox bug 1230207).

CSS Box Alignment currently applies only to CSS Flexbox and CSS Grid.

Implement full support for CSS Box Alignment for CSS Grid, support the missing values: start, end, self-start, self-end, left, right, last-baseline, space-evenly ( Firefox bug 1176782).

The related feature display: contents has been supported since Firefox 37.Resolved value of grid-template-columns,grid-template-rows in px units ( Firefox bug 978212).align-content and justify-content are now supported on grid layouts ( Firefox bug 1151214).align-self and justify-self are now supported on grid layouts ( Firefox bug 1151213).The implied minimum size of grid Items, that is the special min-width and min-height auto behavior has been implemented ( Firefox bug 1176775).Gutters, that is the grid-column-gap, grid-row-gap, and grid-gap properties are now supported ( Firefox bug 1176792).Our implementation of CSS Grids has been improved and is no more considered experimental it is now activated by default in nightly and developer edition, but not for beta and release ( Firefox bug 1000592):.

word-spacing now allows percentage values ( Firefox bug 1038663).

Firefox 45.0 bugs