This evening I posted beta-1 of Google Forms v0.75. This beta release contains a new option to turn off the HTML filter which has been part of Google Forms since the very early iterations of the plugin. In the early days of the Google Forms plugin, the HTML Google generated was full of unnecessary stuff and as a result, it tended to mess up the rendering of the form within WordPress. Over the years Google has iterated on forms a number of times and the HTML is much cleaner and includes new attributes for things like accessibility.
Based on a user request to support the accessibility attributes I decided to offer an option to turn off filtering completely. The disable HTML filtering option is located on the Advanced Tab of the plugin settings.Google Forms Beta (1983 downloads)