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Browser mode and document mode in IE9

I use Developer Tools in IE9 to switch between IE7, 8, and 9 browser modes for testing markup and CSS. I use the following combinations.

IE7 Browser Mode + Document Mode IE7 Standards

IE8 Browser Mode + Document Mode IE8 Standards

IE9 Browser Mode + Document Mode IE9 Standards

But, if I use the following combination, there are several design problems.

IE9 Browser Mode + IE7 Standards

Is the above combination valid? or Do I need to change the document mode drastically?

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1 answer

The only thing to consider when testing using different IE compatibility modes is that they are not exact duplicates of a real copy of IE8 or IE7. Errors and quirks are known in various modes that are not found in a real copy of IE7 or IE8.

Your question asks which of the modes is enough for testing. My answer would be that none of them were. If you really want to know if a site works in IE7 and IE8, you need to check it in IE7 and IE8.

Yes, testing in IE9 with backup mode will give you a close approximation to older versions of the browser, but you will never be completely sure of its correctness. And in the end, the goal of testing is to gain this confidence.

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Source: https://habr.com/ru/post/1442673/

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