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promise_test(async t => {
const fragmentWithTwoScripts = new DocumentFragment();
const script0 = document.createElement('script');
const script1 = fragmentWithTwoScripts.appendChild(document.createElement('script'));
const script2 = fragmentWithTwoScripts.appendChild(document.createElement('script'));
window.kBaselineNumberOfScripts = document.scripts.length;
assert_equals(document.scripts.length, kBaselineNumberOfScripts,
"The WPT infra starts out with exactly 3 scripts");
window.script0Executed = false;
script0.innerText = `
script0Executed = true;
assert_equals(document.scripts.length, kBaselineNumberOfScripts + 1,
'script0 can observe itself and no other scripts');
`;
window.script1Executed = false;
script1.innerText = `
script1Executed = true;
assert_equals(document.scripts.length, kBaselineNumberOfScripts + 2,
"script1 executes synchronously, and thus observes only itself and " +
"previous scripts");
`;
window.script2Executed = false;
script2.innerText = `
script2Executed = true;
assert_equals(document.scripts.length, kBaselineNumberOfScripts + 3,
"script2 executes synchronously, and thus observes itself and all " +
"previous scripts");
`;
assert_false(script0Executed, "Script0 does not execute before append()");
document.body.append(script0);
assert_true(script0Executed,
"Script0 executes synchronously during append()");
assert_false(script1Executed, "Script1 does not execute before append()");
assert_false(script2Executed, "Script2 does not execute before append()");
document.body.append(fragmentWithTwoScripts);
assert_true(script1Executed,
"Script1 executes synchronously during fragment append()");
assert_true(script2Executed,
"Script2 executes synchronously during fragment append()");
}, "Script node insertion is not atomic with regard to execution. Each " +
"script is synchronously executed during the HTML element insertion " +
"steps hook");
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