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X-UA-Compatibility Meta Tag and HTTP Response Header

This functionality will not be implemented in any version of Microsoft Edge.

Web developers can also specify a document mode by including instructions in a meta element or HTTP response header:

If both of these instructions are sent, the developer's preference (meta element) takes precedence over the web server setting (HTTP header).

For more information about how to control default rendering with document modes, see "META Tags and Locking in Future Compatibility" at [MSDN-METATagsLocking].

The X-UA-Compatible value determines Windows Internet Explorer's document as follows:

X-UA-Compatible value

Document modes

IE=5

Quirks Mode

IE=7

IE7 mode

IE=8

IE8 mode

IE=9

IE9 mode

IE=10

IE10 mode

IE=11

IE11 mode

IE=edge

The highest supported document mode of the browser

IE=EmulateIE7

IE7 mode (if a valid <!DOCTYPE> declaration is present)

Quirks Mode (otherwise)

IE=EmulateIE8

IE8 mode (if a valid <!DOCTYPE> declaration is present)

Quirks Mode (otherwise)

IE=EmulateIE9

IE9 mode (if a valid <!DOCTYPE> declaration is present)

Quirks Mode (otherwise)

IE=EmulateIE10

IE10 mode (if a valid <!DOCTYPE> declaration is present)

Quirks Mode (otherwise)

IE=EmulateIE11

IE11 mode (if a valid <!DOCTYPE> declaration is present)

Quirks Mode (otherwise)

For example, in Windows Internet Explorer 8, IE=9, IE=Edge, and IE=EmulateIE9 result in IE8 mode.

Browser emulation modes are not document modes. They instruct Internet Explorer about how to select a document mode when a valid <!DOCTYPE> declaration is included.

The following diagram shows how Internet Explorer determines the appropriate document mode based on the meta element or HTTP header.

技術參考資料

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