How does construct 2 determine if a browser is not supported

How does construct 2 determine if a browser is not supported? I know for a certainty that the default message which states "Your browser does not appear to support HTML5. Try upgrading your browser to the latest version." appears if one is using a browser that is not compatible with jQuery 2. Is this the only check that construct does? When is this done? Are there any other checks to determine if the browser is html5 compatible and where can I see the code for this? Thanks anyone

Something like this:

http://diveintohtml5.info/everything.html

It only shows that message if the browser does not understand the <canvas> tag - or if the browser is running in a compatibility mode that doesn't support it (e.g. IE11 running a site in IE8 compatibility mode).

The only browsers that don't understand <canvas> are IE8 and older, and some very old Android phone's stock browsers. It's nearly universally supported now!