<template> without type not allowed #40280
Description
Description
amphtml-validator will currently fail when a <template> without a type is rendered with two errors:
- The mandatory attribute 'type' is missing in tag 'template'.
- The tag 'template' requires including the 'amp-mustache' extension JavaScript.
It's unclear from the linked documentation why this is a validation error.
React uses <template> to inform the browser to throttle rendering until that element is streamed in (see #40279).
Reproduction Steps
Validate
<!DOCTYPE html>
<html lang="en-US" amp i-amphtml-layout i-amphtml-no-boilerplate transformed="self;v=1">
<head>
<meta charset="utf-8" data-next-head>
<meta name="viewport" content="width=device-width,minimum-scale=1,initial-scale=1">
<style amp-runtime i-amphtml-version="012504091801000"></style>
<script async src="https://cdn.ampproject.org/v0.mjs" type="module" crossorigin="anonymous"></script>
<script async nomodule src="https://cdn.ampproject.org/v0.js" crossorigin="anonymous"></script>
<link rel="expect" href="#«R»" blocking="render">
<link rel="canonical" href="/amp/amp-first">
<style amp-custom></style>
</head>
<body>
<p id="another">another page</p>
<template id="«R»"></template>
</body>
</html>Relevant Logs
The mandatory attribute 'type' is missing in tag 'template'.
https://amp.dev/documentation/components/amp-mustache
The tag 'template' requires including the 'amp-mustache' extension JavaScript. https://amp.dev/documentation/components/amp-mustacheBrowser(s) Affected
No response
OS(s) Affected
No response
Device(s) Affected
No response
AMP Version Affected
No response