How do you understand the semantics of HTML structure?

When the style is removed or lost, the page can present a clear structure:

HTML itself has no performance. We see that for example, <h1> is bold, with a font size of 2em, and bold; <strong> is bold. Don’t think that this is the performance of HTML. These are actually the default css of HTML. Styles are at work, so when the styles are removed or lost, the page can present a clear structure. This is not an advantage of the semantic HTML structure. However, browsers have default styles. The purpose of the default styles is also to better express the semantics of HTML. , it can be said that the browser's default style and the semantic HTML structure are inseparable.

Screen readers (if the visitor is visually impaired) will "read" your page based entirely on your markup.

For example, if you use semantic markup, the screen reader will "spell out" your word instead of trying to pronounce it in full.

PDA, mobile phones and other devices may not be able to render web pages like ordinary computer browsers (usually because these devices have weak support for CSS)

Using semantic markup ensures that these devices render web pages in a meaningful way . Ideally, the viewing device is tasked with rendering web pages consistent with the conditions of the device itself.

Semantic markup provides the relevant information needed by the device, saving you from having to consider all possible display situations (including existing or new devices in the future). For example, a mobile phone can choose to use a markup Title text is displayed in bold. A handheld computer may display it in a larger font. Either way once you mark text as a title, you can be sure that the reading device will read it appropriately on its own terms. Show page.

Search engine crawlers also rely on markup to determine the context and weight of individual keywords

In the past, you may not have considered that search engine crawlers are also "visitors" of the website, but now they are actually extremely valuable users. Without them, search engines will not be able to index your website, and then ordinary users will be very Sad to visit.

It is very important whether your page is easy to understand for crawlers, because crawlers will largely ignore the markup used for performance and only focus on semantic markup.

Therefore, if the title of the page file is tagged instead, then this page may be positioned lower in the search results. In addition to improving ease of use, semantic markup facilitates the correct use of CSS and JavaScript because it itself Provides many "hooks" to apply the style and behavior of the page.

SEO mainly relies on the content of your website and external links.

Easy for team development and maintenance

W3C has set a good standard for us. Everyone in the team follows this standard, which can reduce many differentiated things, facilitate development and maintenance, improve development efficiency, and even

achieve modular development.