93 lines
2.7 KiB
HTML
93 lines
2.7 KiB
HTML
<!DOCTYPE html>
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<meta charset=utf-8>
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<title>Printing</title>
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<link rel=help href="https://html.spec.whatwg.org/#printing">
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<script src="/resources/testharness.js"></script>
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<script src="/resources/testharnessreport.js"></script>
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<script>
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setup({explicit_timeout: true})
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</script>
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<p>Click on the button below.</p>
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<p>If the browser offers to print the current page, dismiss the prompt to
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return to this page. The following should then appear in the box marked as
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"Output":</p>
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<pre>
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before calling print()
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beforeprint
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afterprint
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after calling print()
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</pre>
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<p>If no user dialog appears, either the above or the following should be
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printed in the box marked as "Output":</p>
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<pre>
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before calling print()
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after calling print()
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</pre>
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<p>The test passes if the above criteria are satisfied and "PASS" appears in a
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table below this paragraph. The test fails otherwise.</p>
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<button onclick="testBtn(this)">Click here!</button>
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<h3>Output</h3>
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<pre id=output></pre>
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<script>
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"use strict";
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// This test is actually synchronous, but we use async_test()'s nice
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// infrastructure around t.step() to capture errors in event listeners. This is
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// necessary since it seems like in Chrome, exceptions in beforeprint/afterprint
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// event listeners are not propagated to error events. See
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// https://crbug.com/977828.
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const t = async_test();
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const log = [];
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function out(str) {
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log.push(str);
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output.appendChild(document.createTextNode(str + "\n"));
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}
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function testBtn(btn) {
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btn.remove();
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window.addEventListener("beforeprint", function (ev) {
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// t.step_func() does not preserve `this`, which we test below.
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t.step(() => {
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out("beforeprint");
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assert_equals(Object.getPrototypeOf(ev), Event.prototype);
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assert_equals(this, window);
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assert_equals(ev.target, window);
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assert_equals(ev.type, "beforeprint");
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});
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});
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window.addEventListener("afterprint", function (ev) {
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// t.step_func() does not preserve `this`, which we test below.
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t.step(() => {
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out("afterprint");
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assert_equals(Object.getPrototypeOf(ev), Event.prototype);
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assert_equals(this, window);
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assert_equals(ev.target, window);
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assert_equals(ev.type, "afterprint");
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});
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});
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out("before calling print()");
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print();
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out("after calling print()");
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t.step(() => {
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try {
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assert_array_equals(log, [
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"before calling print()",
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"beforeprint",
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"afterprint",
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"after calling print()",
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]);
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} catch (err) {
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try {
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assert_array_equals(log, [
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"before calling print()",
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"after calling print()",
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]);
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} catch (err) {
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assert_unreached("Output does not match either possibility");
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}
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}
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});
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t.done();
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}
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</script>
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