**Is your feature request related to a problem? Please describe.** I'm not sure anything is widely supported adding the W3C verificator could be interresting. **Describe the solution you'd like** Button on the site sending you to the W3C validator page result for the site, validating CSS, HTML, SVG **Describe alternatives you've considered** We could also use github actions to make this validation instead, this is compatible with the main solution **Additional context** All W3C validator : https://www.w3.org/developers/tools/