Note the ie6 box model and ie6 box model.

Note the ie6 box model and ie6 box model.

When the browser version is too large, it is also tiring, especially for the ie family.

I searched a lot on the Internet and found that it was different from what I saw. Only then did I find that there was a problem with the expression of the other party. When I omitted a few words, it would be ambiguous.

According to Internet ie6, the box model interpretation does not comply with W3C standards.In quirks mode, ie6 does not comply with W3C default interpretation of the box model, while ie6 does comply with W3C default interpretation of the Box Model in standard mode.

This involves how to trigger the ie working mode, which is mainly defined by doctype. The figure below is clear:

(Q: Quirks Mode, weird Mode; S: Standards Mode, standard Mode; A: Almost Standards Mode, Almost standard Mode)

Ie6 is not supported, and only ie8 + is supported. Therefore, be careful if you want to be compatible with ie6. Ie6 parses the box model in the standard mode in line with W3C standards, while bootstrap V3 needs to parse the box model in the weird mode of ie!