BabylonJS loading screen doesn't render

[paulrouget]

I isolated the animation: http://paulrouget.com/test/bbjs/loading.html

code:

<style>
#e1 {
  opacity: 1;
  transition: opacity 1.5s ease 0s;
  pointer-events: none;
  position: absolute;
  left: 0px;
  top: 0px;
  width: 756px;
  height: 692px;
  background-color: black;
}

#e2 {
  position: absolute;
  left: 0px;
  top: 50%;
  margin-top: 80px;
  width: 100%;
  height: 20px;
  font-family: Arial;
  font-size: 14px;
  color: white;
  text-align: center;
}

#e3 {
  position: absolute;
  left: 40%;
  top: 40%;
  width: 20%;
  height: 20%;
}

#e4 {
  position: absolute;
  left: 30%;
  top: 30%;
  width: 40%;
  height: 40%;
  animation: 0.75s linear 0s infinite normal none running spin1;
  transform-origin: 50% 50%;
}

@keyframes spin1 {
  0% { transform: rotate(0deg);}
  100% { transform: rotate(360deg);}
}

</style>

<div id="e1">
  <div id="e2"></div>
  <img id="e3"src="data:image/svg+xml;base64,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">
  <img id="e4" src="data:image/svg+xml;base64,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">
</div>

[paulrouget]

Images are SVG. That explains it.