[webkit-help] How does CSSStyleDeclaration#isPropertyImplicit work?

[Никита Васильев]

WebKit supports unstandard
CSSStyleDeclaration.prototype.isPropertyImplicit method. How does it
work? It seems like it always return false.

<style>
html {background: black}
</style>
<script>
document.styleSheets[0].cssRules[0].style.isPropertyImplicit("background-image")
// false
</script>