Is it possible to change default html5 video player\'s colors or complete skin?
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Yes it is, if your browser supports shadow DOM. On that case you will have selectors available to theme it on css like:
*::-webkit-media-controls-panel {
background-color: red !important;
}
And many other pseudo attributes. To play with it, you can examine the shadow DOM on crome by enabling "Show user agent shadow DOM" on :
Developer tools -> Settings -> Preferences -> Show user agent shadow DOM