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To write a cross-browser CSS, you must know the two modes of the browser parsing CSS: Standard mode (strict modes) and weird mode (quirks modes).
The so-called standard mode refers to the browser in accordance with the standards of the code to parse the execution, the weird mode is to use the browser's own way to parse the execution code, because the different browser parsing executes differently, so we call it a strange mode. whether the browser resolves using standard mode or weird mode, directly related to the DTD declaration in your Web page, the DTD declaration defines the type of standard document (standard schema Parsing) document type, causes the browser to load the Web page and display it in the appropriate way, ignoring the DTD declaration, which will put the Web page into a weird mode (quirks mode).
If your Web page code does not contain any declarations, then the browser will parse it in weird mode, that is, if your page code contains a DTD declaration, the browser will parse it according to the criteria you have declared.
The above code, the browser will be parsed according to the standard of HTML 4.01.
Front End Interview Summary (Html)