tests/gm/gms.html

<!-- Black background so that pixels with alpha are more obvious, rather than
     being composited into the browser below. -->
<canvas id="canvas" style="background-color: black"></canvas>
<script>
  window.onhashchange = function() { location.reload(); }
  function printMessageOnServer(text) {
        // Don't try to use things like "Module['_malloc']" before the
        // emscripten runtime is initialized; early stderr only logs to the
        // browser console (not the deploy_tests.py terminal as well) instead of
        // crashing.
        if (typeof runtimeInitialized === 'undefined' || !runtimeInitialized) {
            return;
        }
        const lengthBytes = lengthBytesUTF8(text) + 1;
        const stringOnWasmHeap = Module['_malloc'](lengthBytes);
        stringToUTF8(text, stringOnWasmHeap, lengthBytes);
        Module['_rive_print_message_on_server'](stringOnWasmHeap);
        Module['_free'](stringOnWasmHeap);
  }
  var Module = {
    'canvas': document.getElementById("canvas"),
    'print': function(text) {
        // Log 1st in case we're in a state where printMessageOnServer crashes.
        console.log(text);
        printMessageOnServer(text + '\n');
    },
    'printErr': function(text) {
        // Log 1st in case we're in a state where printMessageOnServer crashes.
        console.error(text);
        printMessageOnServer(text + '\n');
    },
  };
</script>
<script src="gms.js"></script>