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This tests the early return steps of "prepare a script" that come _before_ step 10 "Set the element's "already started" flag". The relevant steps are steps 6, 7 and 8. If this algorithm returns on any of these steps, the script can be reinserted matching the requirements and will run. https://html.spec.whatwg.org/multipage/scripting.html#prepare-a-script I wrote this test page up while testing something else, but found a bug in Firefox where it doesn't allow re-preparing the script if step 8 fails: https://bugzilla.mozilla.org/show_bug.cgi?id=1735590
120 lines
5.7 KiB
HTML
120 lines
5.7 KiB
HTML
<!DOCTYPE html>
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<html>
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<head>
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<meta charset="UTF-8">
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<meta name="viewport" content="width=device-width, initial-scale=1">
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</head>
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<body>
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<p>
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This tests the early return steps of <a href="https://html.spec.whatwg.org/multipage/scripting.html#prepare-a-script" target="_blank" rel="noopener noreferrer">"prepare a script"</a>
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that come <u>before</u> step 10 "Set the element's "already started" flag". The relevant steps are steps 6, 7 and 8.
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If this algorithm returns on any of these steps, the script can be reinserted matching the requirements and will run.
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</p>
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<p>Expected result:</p>
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<ul>
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<li>Step 6 test: I ran the second time around!</li>
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<li>Step 7 test: I ran the second time around!</li>
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<li>Step 8 test: I ran the second time around!</li>
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</ul>
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<br/>
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<p>Actual result:</p>
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<ul id="result-list">
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</ul>
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<!-- Setup code -->
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<script>
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// This returns a piece of code that will write a result to the actual result section.
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function getTestScript(stepNumber, iteration) {
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return `(() => {
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const resultList = document.getElementById("result-list");
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const resultEntry = document.createElement("li");
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resultEntry.innerText = "Step ${stepNumber} test: I ran the ${iteration} time around!";
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resultList.appendChild(resultEntry);
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})();`;
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}
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</script>
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<!-- Step 6 -->
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<script>
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const stepSixScript = document.createElement("script");
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// 6. If the element has no src attribute, and source text is the empty string, then return. The script is not executed.
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document.body.appendChild(stepSixScript);
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document.body.removeChild(stepSixScript);
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// Step 6 now passes.
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// 10. Set the element's "already started" flag.
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stepSixScript.innerText = getTestScript(6, "second");
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document.body.appendChild(stepSixScript);
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document.body.removeChild(stepSixScript);
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// 1. If the script element is marked as having "already started", then return. The script is not executed.
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stepSixScript.innerText = getTestScript(6, "third");
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document.body.appendChild(stepSixScript);
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</script>
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<template id="step-seven-template">
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<script>
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// This is duplicated from getTestScript as this script will not run because it's not connected.
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// See the NOTE in the script block below about why this is done here.
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(() => {
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const resultList = document.getElementById("result-list");
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const resultEntry = document.createElement("li");
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resultEntry.innerText = "Step 7 test: I ran the first time around!";
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resultList.appendChild(resultEntry);
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})();
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</script>
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</template>
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<!-- Step 7 -->
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<script>
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const stepSevenTemplate = document.getElementById("step-seven-template");
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const stepSevenScript = stepSevenTemplate.content.firstElementChild;
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// 7. If the element is not connected, then return. The script is not executed.
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// NOTE: This is done above because this can only be achieved via the parser, as the script element insertion steps do not prepare the script if the element is not connected.
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// Step 7 now passes.
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// 10. Set the element's "already started" flag.
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stepSevenScript.remove();
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stepSevenScript.innerText = getTestScript(7, "second");
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document.body.appendChild(stepSevenScript);
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document.body.removeChild(stepSevenScript);
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// 1. If the script element is marked as having "already started", then return. The script is not executed.
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stepSevenScript.innerText = getTestScript(7, "third");
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document.body.appendChild(stepSevenScript);
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</script>
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<!-- Step 8 -->
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<script>
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const stepEightScript = document.createElement("script");
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// 8. If either:
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// ...snip...
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// Otherwise, if the script element has a type attribute, let the script block's type string for this script element be the value of that attribute.
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// Determine the script's type as follows:
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// ...snip...
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// - If neither of the above conditions are true, then return. No script is executed.
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stepEightScript.innerText = getTestScript(8, "first");
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stepEightScript.type = "unknown"; // Unknown type - the script won't run.
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document.body.appendChild(stepEightScript);
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document.body.removeChild(stepEightScript);
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// Determine the script's type as follows:
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// - If the script block's type string with leading and trailing ASCII whitespace stripped is a JavaScript MIME type essence match, the script's type is "classic".
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// 10. Set the element's "already started" flag.
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stepEightScript.innerText = getTestScript(8, "second");
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stepEightScript.type = "text/javascript"; // Known type - the script should now run!
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document.body.appendChild(stepEightScript);
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document.body.removeChild(stepEightScript);
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// 1. If the script element is marked as having "already started", then return. The script is not executed.
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stepEightScript.innerText = getTestScript(8, "third");
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document.body.appendChild(stepEightScript);
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</script>
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</body>
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</html>
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