script-text-modifications.html (1602B)
1 <!doctype html> 2 <head> 3 <meta charset=utf-8> 4 <title>Modify HTMLScriptElement's text after #prepare-a-script</title> 5 <link rel=help href="https://html.spec.whatwg.org/multipage/scripting.html#prepare-a-script"> 6 <script src="/resources/testharness.js"></script> 7 <script src="/resources/testharnessreport.js"></script> 8 9 <script> 10 var t = async_test("Modify inline script element's text " + 11 "after prepare-a-script before evaluation"); 12 13 function changeScriptText() { 14 document.querySelector('#script0').textContent = 15 't.unreached_func("This should not be evaluated")();'; 16 } 17 18 t.step_timeout(changeScriptText, 500); 19 </script> 20 21 <!-- This is "a style sheet that is blocking scripts" and thus ... --> 22 <link rel="stylesheet" href="/common/slow.py?pipe=trickle(d1)"></link> 23 24 <!-- This inline script becomes a parser-blocking script, and thus 25 the step_timeout is evaluated after script0 is inserted into DOM, 26 prepare-a-script'ed, but before its evaluation. --> 27 <script id="script0"> 28 t.step(() => { 29 // When this is evaluated after the stylesheet is loaded, 30 // script0's textContent is modified by the async script above, 31 // but the evaluated script is still the original script here, 32 // not what is overwritten, because "child text content" is taken in 33 // #prepare-a-script and passed to "creating a classic script". 34 var s = document.getElementById('script0'); 35 assert_equals(s.textContent, 36 't.unreached_func("This should not be evaluated")();', 37 "<script>'s textContent should be already modified"); 38 t.done(); 39 }); 40 </script>