强迫;“开放阴影根”;在HTML和Javascript中{FirFox}
我试图强迫FireFox在开放阴影模式下创建视频元素的控件,但它不起作用。为什么这样不行强迫;“开放阴影根”;在HTML和Javascript中{FirFox},javascript,html,Javascript,Html,我试图强迫FireFox在开放阴影模式下创建视频元素的控件,但它不起作用。为什么这样不行 <!DOCTYPE html> <html> <head> <script> Element.prototype._attachShadow = Element.prototype.attachShadow;
<!DOCTYPE html>
<html>
<head>
<script>
Element.prototype._attachShadow = Element.prototype.attachShadow;
Element.prototype.attachShadow = function () {
return this._attachShadow( { mode: "open" } );
};
</script>
</head>
<body>
<video>
<source src="a.mp4" type="video/mp4" >
</video>
</body>
</html>
Element.prototype.\u attachShadow=Element.prototype.attachShadow;
Element.prototype.attachShadow=函数(){
返回这个。_attachShadow({mode:“open”});
};