Which program check a website's codding errors?

I am making a webiste with HTML and CSS.

Before I complete it, I want to check coding errors like a grammar check.

How can I check coding errors? (which program)

Hi @2021sky !

Welcome to the forum!

It sounds like you are looking for HTML and CSS validators

https://jigsaw.w3.org/css-validator/#validate_by_input

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