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It has been many years since the HTML5 standard specification was completed and publicly released, and it is indispensable to ask for an understanding of HTML5 semantics during the interview. But in actual use, it seems that there are not a lot of people who really use HTML5 tags to develop (ps: check the website of several giant companies), maybe part of the reason is that some users are still using low-version browsers. But as far as I am concerned, I still use div because of the entanglement when selecting some tags. (PS: It is precisely because of this that this article came up. That's right, we should pay attention to semantics in the future) What is semantics? It is to display the content with reasonable and correct tags, such as h1~h6 to define the title. Semantic advantages: It is easy for users to read, and the page can show a clear structure when the style is lost. Conducive to SEO, search engines determine the context and the weight of each keyword based on tags. It is convenient for other devices to analyze. For example, blind readers render web pages based on semantics. It is beneficial to development and maintenance. The semantics are more readable, the code is better maintained, and the relationship with CSS3 is more harmonious.