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Quirks Mode emulation is used in the following circumstances:
A page in IE9 Mode loads a Quirks Mode HTML page in an iframe.
A frameset in IE9 Mode loads Quirks Mode content in a frame.
Only content in child pages is rendered using Quirks Mode emulation. Windows Internet Explorer continues to render the containing document in IE9 Mode.
Quirks Mode emulation is not used when loading child pages
that specify a standard <!DOCTYPE>, or those that use the X-UA-Compatible meta tag to specify support for Windows
Internet Explorer 8, Windows Internet Explorer 9, or EdgeHTML Mode. These pages
are rendered with IE9 Mode instead. For more information about how Internet
Explorer selects Document Mode, see [MS-IEDOCO]
section 2.1.3.