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How to add a class to a given element?
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Get element's custom css properties (-mystyle) using JavaScript
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Create styled image programmatically
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How do I add a class to the HTML "body" tag programmatically?
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How do I add CSS files?
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Is there a CSS selector by class prefix?
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Nesting CSS classes
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programmatically scrolling a set of divs inside a parent div
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How do you execute a dynamically loaded JavaScript block?
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Remove CSS class from element with JavaScript (no jQuery)
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Apply a style to a selected structure
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How to add a custom CSS class to core blocks in Gutenberg editor?