For quite a while, Google maintained an option that allowed users to switch to the basic HTML mode in Gmail, and there were a number of reasons for this. Early on, some browsers simply weren’t up to snuff with modern web standards, and others needed a basic mode simply because of bandwidth restrictions.
Google quietly removed this option, or at least the link to it, which used to appear on your Gmail page. As for the actual possibility for using the HTML mode, well, that hasn’t actually gone away, just been hidden.
To get back to it now, you just need to know the link — that’s really all there is to it. Head over to https://mail.google.com/mail/?
Of course, remembering that link, or returning to this posts, isn’t particularly a useful way of dealing with this problem, so I recommend that you bookmark it — perhaps even add it your menu bar for easy access.
If all of this sounds too complicated, then there is another option — a Chrome extension can also handle this for you. Basic HTML Email Toggle is exactly what it wounds like. A simple switch that allows you to seamlessly move back and forth between regular and HTML versions of the Google email service.