Nope, built-in html5 target for GLBasic works only with simple stuff, it's rather germ of what it could be. It works with tutorials, basic showcase projects.
At least in my feeling, throw any larger project, complicated code and that will crash. As code is compiled with emscripten, obfuscated and packed into binary (or whatever that process is called) there is no simple way to trace bugs, make workarounds and so on..
For example, for drawing I'm using only PolyVectors, with render2texture/page drawing for some effects all code written in GLB, working even on android, crashing with html5.
Current html5 target may be sufficient for someone, but at least I would be interested in any working alternative :-) Maybe not as main target/platform, but rather additional/bonus, but it would be nice if it could be also used to port games to other not supported platforms.
Happy New Year ;-)