How do I open a Web page with a larger font size?

What if the font size of the Web page becomes larger?

Sometimes we find that some of the pages of the font is somehow magnified (the resolution becomes larger or smaller), and the other site looks normal resolution, what is this?

Originally we inadvertently enabled the IE amplification function, that is, when your mouse pointer rests on a Web page, the font and resolution change when you press CTRL + the mouse wheel, and when you visit the site next time, the resolution of the page you modified will be maintained, so you need to press CTRL + again The mouse wheel to adjust the font.

But not all of the Web page can be used to adjust the resolution of the above (the specific reason is not clear), but Baidu and Google's Web page font size can be adjusted by the wheel +ctrl! And it can automatically keep the modified state!