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How can I dynamically add CSS to Shadow root in Java script?

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Jul 30.2020

I create a Shadow root in JS and add a few buttons to it.
Becuase this is shadow root, it doesnt inherit any CSS from HTML outside.
How can I add a <link css> to this shadow root in JS? Or how can I inherit the CSS from the container it is in?

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CSSJavaScript

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@VITSUSAJul 31.2020 — Although I'm not sure why you want to create CSS classes with JavaScript, here is an option:

var style = document.createElement('style');

style.type = 'text/css';

style.innerHTML = '.cssClass { color: #F00; }';

document.getElementsByTagName('head')[0].appendChild(style);

document.getElementById('someElementId').className = 'cssClass';

There is a light jQuery plugin option also which allows to generate CSS declarations: jQuery-injectCSS

In fact, it uses JSS (CSS described by JSON), but it's quite easy to handle in order to generate dynamic css stylesheets.

$.injectCSS({

"#test": {

height: 123

}

});
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