LayoutTests/editing/mac/spelling/autocorrection-in-textarea.html

<div contenteditable>
    0123456789
</div>
<script>
    if (window.testRunner)
        testRunner.dumpAsText();

    onload = function() {
        var textarea = document.getElementById("textarea");
        textarea.focus();
        var hasBeenBlurred = false;
        textarea.onblur = function() {
            hasBeenBlurred = true;
        }

        document.execCommand("InsertText", false, "te");
        document.execCommand("InsertText", false, "h");
        document.execCommand("InsertText", false, " ");

        document.execCommand("InsertText", false, "test result is");

        var result = textarea.value === "the test result is" ? "PASS" : "FAIL";
        document.getElementById("result").appendChild(document.createTextNode(result));
    }
</script>
<textarea id="textarea"></textarea>
<p id="result"></p>