Articles tagged with #web-components (3)

"Failed to construct 'CustomElement': The result must not have children"

The CSS pseudo-class :defined is for defined (custom) elements, sure. But what does "defined" really mean? While reading about upgrading CBEs I came across the definition for it. Let me quote the DOM spec a bit.
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More HTML provides a CBE (Customized Built-in Element) for upgrading heading tags such as H1, H2, ... to render a link-icon beside them, as many know it from github readme files.
I wanted to upgrade all picostitch sites automatically by just including a <script> which upgrades all headings on the page and adds this functionality.
It is not possible to upgrade a parsed and rendered element (like an H1) afterwards.
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