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Support parsing .htm as same as .html

See original GitHub issue

Description

We are currently working on a rebuild of our old website.
I included the .htm file in the build target for now, but the build failed with a Parse error.
.htm files are rendered correctly in most modern browsers.
According to RFC2854 and this IANA text, .html and .htm are commonly used HTML extensions and I believe they should be used in vite.

It is a small thing, but I think it will be useful.

Also, I found a regular expression in the HTML plugin file that seems to support .htm, but it is not actually supported.
If the suggestion in this Issue is not good, why is this regex in there?

Actual works method

in node/plugins/html/ts:301

    async transform(html, id) {
      if (id.endsWith('.html')) {
        const relativeUrlPath = path.posix.relative(

    async transform(html, id) {
      if (id.endsWith('.html') || id.endsWith('.htm')) {
        const relativeUrlPath = path.posix.relative(

Alternative

No response

Additional context

Parse error I got:

> homepage@0.0.0 build T:\projects\vite-test
> vite build

vite v3.2.4 building for production...
✓ 0 modules transformed.
[vite:build-import-analysis] Parse error @:8:28
file: T:/projects/vite-test/src/pages/a.htm:8:27
 6:           content="width=device-width, user-scalable=no, initial-scale=1.0, maximum-scale=1.0, minimum-scale=1.0">
 7:     <meta http-equiv="X-UA-Compatible" content="ie=edge">
 8:     <title>Document</title>
                               ^
 9: </head>
10: <body>
error during build:
Error: Parse error @:8:28
    at parse$b (file:///T:/projects/vite-test/node_modules/.pnpm/vite@3.2.4/node_modules/vite/dist/node/chunks/dep-67e7f8ab.js:32642:355)
    at Object.transform (file:///T:/projects/vite-test/node_modules/.pnpm/vite@3.2.4/node_modules/vite/dist/node/chunks/dep-67e7f8ab.js:42081:27)
 ERROR  Command failed with exit code 1.

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