I reckon someone should create a browser that's really strict and acts like a linting tool whilst you're building. For example, it would refuse to style any elements with a repeated ID, or would throw PHP-esque errors if you nest something incorrectly.

It wouldn't get used as a conventional browser, but would be a really good tool to ensure you're writing the best markup/CSS possible. Current browsers are very forgiving when it comes to small mistakes in code, but a super-strict production browser would be great!

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