Remove getPropertyCSSValue() getPropertyCSSValue is a deprecated feature. https://developer.mozilla.org/en-US/docs/Web/API/CSSStyleDeclaration/getPropertyCSSValue https://searchfox.org/wubkat/search?q=getPropertyCSSValue&path=&case=false®exp=false This is not available in Chrome and Firefox. https://caniuse.com/mdn-api_cssstyledeclaration_getpropertycssvalue
<rdar://problem/99666126>
*** This bug has been marked as a duplicate of bug 229804 ***