keydown-keypress-preventDefault.html

<html>
<script>
    function test() {
        var tf = document.getElementById('tf');
        tf.focus();
        if (window.testRunner) {
            testRunner.dumpAsText();
            eventSender.keyDown('F');
            eventSender.keyDown('A');
            eventSender.keyDown('I');
            eventSender.keyDown('L');
            log(tf.value);
        }
    }
    
    function log(msg) {
        var res = document.getElementById('res');
        res.innerHTML = res.innerHTML + msg + "<br>";
    }
</script> 
<body onload="test()">
    This tests that preventing the default behavior for a keydown event will prevent the keypress event from firing, and will prevent text from being inserted.<br>
    This matches IE7, but not Firefox, which still dispatches a keypress.<br>
    <input id="tf" onkeydown="log('key down'); return false" onkeypress="log('key press')">
    <br>
    <div id="res"></div>
</body>
</html>

chromium/third_party/blink/web_tests/fast/events/keydown-keypress-preventDefault.html