This PR adds the ability to create shadow DOM trees in pure HTML, without a single line of JavaScript.
<div>
<template shadowrootmode="open">
this becomes the shadow tree inside the div element!
</template>
this text is a normal child of the div element.
</div>
This required updating a bunch of algorithms in the HTML parser & serializer, the DOM node cloning algorithm (which can now throw!), and more.
I ended up doing all this because the extension I'm using to save full pages as a single HTML file in Firefox (for debugging with Ladybird) started outputting HTML files with declarative shadow DOMs! :sweat_smile:
This passes a lot of the WPT tests, but then a lot of them fail because we don't yet have Element.setHTMLUnsafe(). That'll be an exercise for another day!
This PR adds the ability to create shadow DOM trees in pure HTML, without a single line of JavaScript.
This required updating a bunch of algorithms in the HTML parser & serializer, the DOM node cloning algorithm (which can now throw!), and more.
I ended up doing all this because the extension I'm using to save full pages as a single HTML file in Firefox (for debugging with Ladybird) started outputting HTML files with declarative shadow DOMs! :sweat_smile:
This passes a lot of the WPT tests, but then a lot of them fail because we don't yet have
Element.setHTMLUnsafe(). That'll be an exercise for another day!