Make clipboard-apis tests more robust to local variations in html (we…

…b-platform-tests#49255)

This makes the test more robust to variation of markup resulting of clipboard operation. It really tests the script element has been removed and not that the full html is identical to a canonical form.

clipboard-apis/async-html-script-removal.https.html

@@ -31,8 +31,9 @@
 const html_with_script =
   '<title>Title of the document</title> <script>const a = 5;</scr'
   + 'ipt> <p>Hello World</p>';
-const html_without_script =
-  '<title>Title of the document</title> <p>Hello World</p>';
+const html_script =
+  '<script>const a = 5;</scr'
+  + 'ipt>';
 promise_test(async t => {
   await tryGrantReadPermission();
   await tryGrantWritePermission();
@@ -53,8 +54,7 @@
   const blobText = await (new Response(blobOutput)).text();
 
   const outputHtml = reformatHtml(blobText);
-  const inputHtml = reformatHtml(html_without_script);
-  assert_equals(outputHtml, inputHtml);
-}, 'Verify write and read clipboard with scripts removed given text/html: '
-    + html_with_script);
+  const html_script_no_spaces = reformatHtml(html_script);
+  assert_true(!outputHtml.includes(html_script_no_spaces));
+}, 'Verify write and read clipboard with scripts removed given text/html. The string "' + html_script + '" has been removed.');
 </script>

clipboard-apis/async-navigator-clipboard-read-resource-load.https.html

@@ -34,7 +34,7 @@
   const htmlBlob = await items[0].getType("text/html");
   const html = await htmlBlob.text();
 
-  assert_equals(html, '<img src="https://example.com/oops">');
+  assert_true(html.includes('<img src="https://example.com/oops">'));
 
   // Allow resource loading to start asynchronously
   await new Promise(resolve => test.step_timeout(resolve, 100));