I am working on a HTLM editor who combine HTML & CSS in the same page. I want that the users have a zoom when mouseover on a picture in front page
Here a full example working with css :hover. No need JS.
You need to set the style element into your head element out of body element

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Here is a solution with JS Adapt from answer here : Javascript: Zoom in on mouseover WITHOUT Jquery or plugins
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- Puis, cliquez sur "Suivant".
Last example with style directly in body:
It is accepted normaly based https://www.w3.org/Submission/1996/1/WD-jsss-960822

4. Entrez votre mot de passe.
- Puis, cliquez sur "Suivant".