selection: Split collapse.html into 2, and extend.html into 3. (#4561) * selection: Split collapse.html into 2, and extend.html into 3. The text dump of collapse.html and extend.html result exceed the file size limit in Chromium project. This is similar to: https://github.com/w3c/web-platform-tests/pull/4049 https://github.com/w3c/web-platform-tests/pull/4549 * Add comments to common.js 
diff --git a/selection/extend-40.html b/selection/extend-40.html new file mode 100644 index 0000000..f0b78d6 --- /dev/null +++ b/selection/extend-40.html 
@@ -0,0 +1,16 @@ +<!doctype html> +<title>Selection extend() tests</title> +<meta charset=utf-8> +<meta name=timeout content=long> +<body> +<script src=/resources/testharness.js></script> +<script src=/resources/testharnessreport.js></script> +<script src=common.js></script> +<script src=extend.js></script> +<div id=log></div> +<script> +"use strict"; + +testExtendSubSet(40); +testDiv.style.display = "none"; +</script>