DOCTYPE
Doctype is to tell the browser which version of html to use to parse instructions. It must be on the first line. In some versions, DTD needs to be introduced. HTML5 does not need to introduce DTD
Chinese garbled characters
Cause
The encoding format of the browser parsing code is inconsistent with the source code encoding format. For example, if the document is saved as GBK, garbled characters will appear
Solution
Whichever format is used to parse, whichever encoding format is used to save the code.
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