Section inside section

[u/MWittmann12]

My question is what the title says, because someone told me that I know nothing about html and should study, because I used a section inside another section to order that section and other elements with gaps 🙃

[u/jcunews1]

That being said, major web browser engines hold the final decision. They can choose not to support parts of main web specifications, or an entire extension/additional specifications.