LayoutTests/webgl/webgl-texElementSubImage2D-webgl2-only.html

<!-- webkit-test-runner [ HTMLInCanvasEnabled=true ] -->
<!DOCTYPE html>
<html>
<head>
<script src="../resources/js-test.js"></script>
</head>
<body>
<script>
description("Tests that texElementSubImage2D() is only available on WebGL2.");

const gl1 = document.createElement("canvas").getContext("webgl");
const gl2 = document.createElement("canvas").getContext("webgl2");

shouldBeNonNull("gl1");
shouldBeNonNull("gl2");

shouldBeEqualToString("typeof gl1.texElementSubImage2D", "undefined");
shouldBeFalse("'texElementSubImage2D' in gl1");
shouldBeFalse("'texElementSubImage2D' in WebGLRenderingContext.prototype");

shouldBeEqualToString("typeof gl2.texElementSubImage2D", "function");
shouldBeTrue("'texElementSubImage2D' in gl2");
shouldBeTrue("'texElementSubImage2D' in WebGL2RenderingContext.prototype");
</script>
</body>
</html>