Vite HMR bug when serving only HTML

[leonsilicon]

Describe the bug

When using Vite with only an HTML file, changing the code creates an HMR request but this doesn't update the HTML.

This worked in vite@2.9.0-beta.0 but stopped working in vite@2.9.0-beta.1

Here's a repro showing the regression: https://github.com/leonzalion/vite-hmr-bug

And a video:

bug.mp4

Reproduction

https://stackblitz.com/edit/vitejs-vite-vmzqtg?file=index.html&terminal=dev

System Info

System:
    OS: macOS 11.6.4
    CPU: (16) x64 Intel(R) Core(TM) i9-9900K CPU @ 3.60GHz
    Memory: 37.89 GB / 64.00 GB
    Shell: 5.8 - /bin/zsh
  Binaries:
    Node: 17.8.0 - ~/Library/pnpm/node
    Yarn: 1.22.17 - /usr/local/bin/yarn
    npm: 8.5.5 - ~/Library/pnpm/npm
  Browsers:
    Brave Browser: 100.1.37.114
    Chrome: 100.0.4896.127
    Firefox: 99.0
    Safari: 15.3

Used Package Manager

pnpm

Logs

No response

Validations

• Follow our Code of Conduct
• Read the Contributing Guidelines.
• Read the docs.
• Check that there isn't already an issue that reports the same bug to avoid creating a duplicate.
• Make sure this is a Vite issue and not a framework-specific issue. For example, if it's a Vue SFC related bug, it should likely be reported to https://github.com/vuejs/core instead.
• Check that this is a concrete bug. For Q&A open a GitHub Discussion or join our Discord Chat Server.
• The provided reproduction is a minimal reproducible example of the bug.

[sapphi-red]

#7262 is affecting this.

[sapphi-red]

For a workaround, split css into a different file.

<style>@import './foo.css'</style>

body { background-color: yellow; }