How to check if your web page has valid HTML code

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Use this link:
https://validator.w3.org/

Example:
https://validator.w3.org/nu/?doc=http%3A%2F%2Flunlun.com%2F44%2F

You’ll receive hints how to fix the errors and warnings your page might generate.

You can upload a file, check a URL, or paste directly the HTML code you want to check.

Have you seen this?

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