I want to test fallback if a browser isn't HTML5 ready. Is there an easy way to disable HTML rendering in Chrome?
Firefox has an extension to enable/disable html5. I think it would be exactly what you are looking for if you are willing to your testing on Firefox. It is called HTML5toggle. Its description is:
Turn on or off browser support for HTML5
You cannot disable HTML5 rendering but if you can run an older version. Here is how:
<chrome-executable> --chrome-version=<version> --user-data-dir=<dir>
You must obviously have that version installed and it is possible to have multiple versions at a time on the same machine. You should notice there is a sub-directory for each version, for example one of my systems has 24.0.1312.57 and 25.0.1364.97.
With the above command-line and place-holders substituted, the correct version shall be executed. Note that you must not reuse an existing user-directory, simply point the user-data-dir to an empty directory where the user has write permissions and a profile for the specific version of Chrome will be created.
You can't disable HTML5 rendering in Google Chrome.
Moreover, Google Chrome installations are user specific, so you can't use two different versions of Chrome in the same computer. Try to install an old version of Chrome (before 3.0.195: native HTML5 support) on another computer to test your website without HTML5 rendering.
Otherwise, try to use a web browser without HTML5 support like Internet Explorer 6.
In order to know support of HTML5 components for web browsers, you can visit this very useful website.