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Shadow DOM and custom style

So, I read the article and, as I understand it, each widget of its own browser is a combination of basic elements, styles and scripts. This begs the question - if they consist of basic building blocks, does this mean that there is a way to configure them via JavaScript? And I don't mean the alternative way some JavaScript libraries / plugins do it - simply by accessing their Shadow DOM properties and, for example, adding some CSS styles to them. In addition, this page has some use cases, but nothing practical.

Has anyone ever tried something like this? Is it even possible? Downsides?

Thanks.

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My main problem was that the shadow DOM implementations would be different between browsers, and then you basically need some kind of library to handle it. I am not sure if this is so, but it is worth considering. Also, given that there are so many widget libraries, and this is the standard way to handle most of these problems, is it worth using a whole new set of unknown problems instead of just working with known elements?

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Source: https://habr.com/ru/post/1335743/

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