Text mode under IE! Introduction to the function of DOCTYPE_HTML/Xhtml_Web page production

After solving the form auto-filling problem mentioned in the previous article, we encountered a new problem, that is, part of the page style was incorrectly displayed in IE. Use the IE developer tools to check the existence of the corresponding styles, and compare it with the local HTML page that can be displayed correctly. The styles are basically the same, except that some font styles are displayed as font-size styles in the developer tools. Everything else is the same, including causing the styles to be displayed incorrectly. margin style. Finally, it was discovered through the developer tools that the text modes of the two pages are different. The text mode of the page that can be displayed correctly is the standard mode, while the text mode of the page that displays abnormally is the miscellaneous mode.

When viewing the web page source code, it was found that the abnormal web page was decorated through sitemesh, and the decorated page did not define the text mode!DOCTYPE, causing the browser to not parse the web page through the standard mode.

! Document type (English abbreviation!DOCTYPE, English full name DOCumentTYPE), a!DOCTYPE is a document type declaration of Standard Universal Markup Language. Its purpose is to tell the Standard Universal Markup Language parser what kind of document type definition it should use. (DTD) to parse the document. It appears as the first line of the file and has the following form:
!DOCTYPE html
PUBLIC "quoted string">
"quoted string" is a public identifier that is called , which refers to a required document type definition (DTD) by a "well-known" name, usually by a relevant standard. [1]
Availability:
Specifies whether the Formal Public Identifier (FPI) is a publicly accessible object or a system resource.
The International Internet Engineering Task Force (IETF) and the World Wide Web Consortium (W3C) are not registered ISO organizations.