The current webpage is composed of three elements: HTML, CSS, and JS. HTML is the most important part and the skeleton of the entire webpage, CSS and js are modified based on the skeleton to make the webpage a bloody and movable "person ". If the HTML design is unreasonable, it is similar to a person with a poor skeleton. Even if the appearance is modified, it cannot cover up his obvious defects.
HTML tags have semantic considerations. For example, table semantics is "table", tr is "unit row", and td is "cell ". A simple orientation for determining whether the semantics of a webpage tag is good is:"Remove the style and check whether the webpage structure is orderly and readable.". For a page with good semantics, the h tag should be complete and orderly, and arranged in sequence according to h1, h2, h3, and h4. You can use web Developer or firebug in your work. The W3C official website is a typical well-defined semantics, http://www.w3.org /.
Below is the W3C official website for removing styles