javascript - The iframe tag is introduced into the html page. The content in the tag is the same as the original html content. Why is it displayed differently on the page?

Question

This is a pure HTML static web page, I want to share a footer

Answer 1

iframe should contain a complete html page with html bodytags

Answer 2

The web page embedded in the iframe does not use your style

Answer 3

Because iframe is equivalent to you embedding a new webpage, the tags in the iframe cannot be obtained on the current webpage, so this webpage cannot use the css style of the current webpage

Answer 4

The page in the iframe omits the head and body tags, resulting in the corresponding style files not being introduced, so it looks different