Custom properties, conditional and property rules, CSS-wide keywords, calc() and attr() #114
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… calc() and attr()
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Add native supports for several CSS improvements, which until now required the use of the Transcoder Helper, but now are available out-of-the-box.
Custom properties (
var()function).The
@propertyrule (registered custom properties).@supportsrules.Media Queries level 4, including the
prefers-color-schememedia feature. As a result, theKEY_PREFERS_COLOR_SCHEMEtranscoding hint was added.calc()expressions.The
initial,unsetandrevertCSS-wide keywords (this being SVG,revertis currently handled asunset).Initial support for the advanced
attr()value that Google Chrome intends to support soon (currently at prototype level).In addition to this, it implements a true resolution concept: the resolution is no longer used in CSS unit conversions, matching the behaviour of web browsers. That resolution is also available to CSS Media Queries. To make it available to the transcoder, the
KEY_RESOLUTION_DPItranscoding hint was added.The old
KEY_PIXEL_UNIT_TO_MILLIMETERtranscoding hint can still be used, but is no longer used in CSS unit conversions (only in the encoding phase).