Gitpod has great HTML and CSS support. In fact, Gitpod was made with web development in mind. And, depending on your needs, you may want to customize this experience further!

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Example Repositories

Here are a few HTML/CSS example projects that are already automated with Gitpod:
RepositoryDescriptionTry it
Front-End-ChecklistThe perfect Front-End Checklist for modern websites and meticulous developersOpen in Gitpod
DevhintsTL;DR for developer documentation - a ridiculous collection of cheatsheetsOpen in Gitpod

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emmet  Support

emmet demo Gitpod comes with emmet support right out of the box giving you access to powerful snippets and completions

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Live Preview

Live Preview Demo With Gitpod you can open a preview for HTML files while you are coding. You can do this by opening a web server python -m http.server 8000. You can also automate this in your .gitpod.yml file, so that every time you start a new workspace your preview is ready to go. For example: 
tasks:
    - name: Start web server
      init: python -m http.server 8000

ports:
    - port: 8000
      onOpen: open-preview

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Try It!

Want to see a minimal example in action? Try it out by opening an example on Gitpod: gitpod-io/Gitpod-Web-Development-Example