Various
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Dialog and Modals
How to use the HTML dialog element
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The popover API
How the popover API works, what it does and how to use it.
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Various 1
Lotsa stuff inc. object-fit, resize, style order, the main tag and more
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Various 2
retro colours by CSS name, absolute positioning, CSS custom properties & more
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Various 3
Some interesting ways to style headings and text