Adds support for <number> css value type to the CSS property tab-size, which determines the tab size used to render preserved tab characters. 'tab-size' accepts an <integer> or a <number> as its value type, and represents the measure as a real-number multiple of the space character’s advance width, in addition to its integer multiple.
Explainers: https://drafts.csswg.org/css-text-3/#tab-size-property