Add --text-shadow support (resolve #2592) #2691
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This enables initial support for text-shadow.
In order to support the feature properly, this change applies a CSS variable called
--text-shadow
instead of using the normaltext-shadow
CSS property. Some elements (such as the upper line of a square root or the dividing line for a fraction) are implemented as blocks rather than text.This change applies the
--text-shadow
variable to bothtext-shadow
orbox-shadow
depending upon the element to create a uniform appearance