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You can read more about it here: developer.chrome.com/blog/declara... I'm really excited to see this starting to land as honestly believe it will change the way we write HTML (whether directly, or through frameworks!!). And now it's starting to land you can think about starting to use it for real!

This is shipping fast thanks to excellent work by @nomster.bsky.social and @foolip.org along with lots of help from others like @annevk.nl and @zcorpan.bsky.social reviewing spec changes! We're getting positive vibes from those other browsers and have polyfills in the meantime.

Yay! Is there a programmatic way to look at markers? Can I have my own custom markers to mark sections of the DOM for JS purposes?

Absolutely! Have a look at the polyfill to see how I use a TreeWalker: github.com/GoogleChrome... In Chrome they are now Processing Instructions whereas in other browser (that don’t support them) they are still treated as Comments and they have slightly different formats to look at the contents.