File: recursive-exec-command-calls.tentative.html

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<!doctype html>
<meta charset=utf-8>
<title>Test recursive `Document.execCommand()` calls</title>
<script src=/resources/testharness.js></script>
<script src=/resources/testharnessreport.js></script>
<div contenteditable><br></div>
<script>
"use strict";

setup({explicit_done: true});

/**
 * This test checks whether the browser allows or disallows recursive
 * Document.execCommand() calls.
 * https://github.com/w3c/editing/issues/200#issuecomment-578097441
 */
function runTests() {
  test(function () {
    let editor = document.querySelector("div[contenteditable]");
    editor.focus();
    let counter = 0;
    editor.addEventListener("input", event => {
      if (++counter < 10) {
        let result = document.execCommand("insertText", false, `, ${counter}`);
        assert_false(result,
            '`execCommand("insertText") in the "input" event listener should return `false`');
      }
    });
    document.execCommand("insertText", false, "0");
    assert_equals(editor.textContent, "0",
        '`execCommand("insertText") in the "input" event listener should do nothing');
  }, "Recursive `Document.execCommand()` shouldn't be supported");
  done();
}

window.addEventListener("load", runTests, {once: true});
</script>