How to use code to set ie11 to force open compatibility view or use ie8 kernel? _html/css_WEB-ITnose

I added the following code to the meta tag in the header of the page, but it didn’t work:

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Why add so many?

IE=8: will force the page to be rendered according to IE8 standards, ignoring the document type declaration.
IE=edge: Always render the page in the latest document mode, ignoring the document type.
IE=EmulateIE8: If there is a document type declaration, the page will be rendered in IE8's standard mode, otherwise it will be rendered in IE mixed mode.

You can just use the first or the third one, why do you need to use the three together?

Why add so much?

IE=8: will force the page to be rendered according to IE8 standards, ignoring the document type declaration.
IE=edge: Always render the page in the latest document mode, ignoring the document type.
IE=EmulateIE8: If there is a document type declaration, the page will be rendered in IE8's standard mode, otherwise it will be rendered in IE mixed mode.

You can just use the first or the third one, why do you need to use the three together?

Is there ??? or multiple ???, but none of them have any effect

Why do you need to add so many?

IE=8: will force the page to be rendered according to IE8 standards, ignoring the document type declaration.
IE=edge: Always render the page in the latest document mode, ignoring the document type.
IE=EmulateIE8: If there is a document type declaration, the page will be rendered in IE8's standard mode, otherwise it will be rendered in IE mixed mode.

You can just use the first or the third one, why do you need to use the three together?

Is there a ??? or multiple ???, but none of them work?
In addition to the title element and other meta elements, Must appear before other elements in the header section of the web page.
See if there are any additional tags in front of this setting.

Just change 8 to 7, can you??

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