Streaming HTML out of order without JavaScript (via) A really interesting new browser capability. If you serve the following HTML:
<template shadowrootmode="open">
<slot name="item-1">Loading...</slot>
</template>
Then later in the same page stream an element specifying that slot:
<span slot="item-1">Item number 1</span>
The previous slot will be replaced while the page continues to load.
I tried the demo in the most recent Chrome, Safari and Firefox (and Mobile Safari) and it worked in all of them.
The key feature is shadowrootmode=open
, which looks like it was added to Firefox 123 on February 19th 2024 - the other two browsers are listed on caniuse.com as gaining it around March last year.
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