| Index: LayoutTests/scrollbars/custom-scrollbar-changing-style.html
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| diff --git a/LayoutTests/scrollbars/custom-scrollbar-changing-style.html b/LayoutTests/scrollbars/custom-scrollbar-changing-style.html
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| new file mode 100644
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| index 0000000000000000000000000000000000000000..0588075b5dc9a1b82f0f8b40f412cdda1fad501e
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| --- /dev/null
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| +++ b/LayoutTests/scrollbars/custom-scrollbar-changing-style.html
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| @@ -0,0 +1,26 @@
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| +<!DOCTYPE html>
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| +<style>
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| +::-webkit-scrollbar {
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| +    height: 10px;
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| +    width: 10px
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| +}
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| +::-webkit-scrollbar-thumb {
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| +    background: rgba(255,0,0,0.8);
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| +}
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| +html {
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| +    overflow-y: scroll;
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| +}
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| +</style>
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| +<div style="height:700px"></div>
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| +<script>
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| +var styleElement = document.createElement("style");
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| +var sheet = document.head.appendChild(styleElement).sheet;
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| +function addRule(selector, css){
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| +    var propText = Object.keys(css).map(function(p){
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| +        return p+":"+css[p]
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| +    }).join(";");
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| +    sheet.insertRule(selector + "{" + propText + "}", sheet.cssRules.length);
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| +};
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| +document.body.offsetTop;
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| +addRule("::-webkit-scrollbar-thumb", {background: "rgba(13,53,178,0.8)",});
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| +</script>
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| 
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