HTML5Broad concept: represents the stage of browser technology development, which is html5 css3 and js(API)A combination of front-end technologies.
HTML5 has newly defined a bunch of semantic tags, which is more conducive to search engines or assistive devices in understanding the content of the HTML page. In browsers that do not support HTML5 new tags, these new tags will be parsed into inline elements (inline) and treated. So we just need to convert it into a block element (block) to use. Lower versions use conditional comments:
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