LOL. Good to know. Another thing is, do you know about currently limitations in HTML5 export ? I always exported to windows with no problems, so I don´t how if HTML5 can handle particle system, multiple collisions or other game maker features.
Physics system, 3D functions, particles, tile based collisions etc. work in Html5 as well. On html5 platform, you'll have access to some more functions and constants such as
browser_width,
browser_height etc.
Also, WebGL is the web version of OpenGL ES (mobile platforms use this graphics library). This means that you can also use
shaders on Html5 games. If you wish to not to use WebGL(maybe your game is targeted for really low-quality devices, then you can disable it as well. Disabling it just disables some of the available functions(such as shaders, blending mode etc.)