The HTML5 module has some functions that are specifically
designed to be used by the games that target it, although it should
be noted that some of them may also work for other target platforms
too.
The available functions for HTML5 are:
Apart from these functions for the HTML5 target module, there is also a special JavaScript variable that can be used on those rare occasions when the contents of the html5game folder are stored in a completely different place (URL). Normally this path is hard-coded in the JavaScript file and is relative to the location from where the JavaScript is called, but you can set the variable g_GameMakerHTML5Dir before the call to the game script and the game will be run from the newly defined location. For example:
<script>var g_GameMakerHTML5Dir =
"http://mygamealternatedirectory.com/";</script>