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Content value Meaning IE=5
Renders using Internet Explorer 5 Quirks mode.
IE=7
Renders using Internet Explorer 7 standards mode.
IE=8
Renders using Internet Explorer 8 standards mode.
IE=9
Renders using Internet Explorer 9 standards mode.
IE=10
Renders using Internet Explorer 10 standards mode.
IE=Edge
Renders using the latest mode. This mode is the recommended for all websites.
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<meta http-equiv="x-ua-compatible" content="IE=9">