WheelEvent.ctrlKey.zoom.html

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<!DOCTYPE html>

<html>

    <head>

        <title id='desc'> WheelEvent: wheel - MouseEvent.ctrlKey and Zooming </title>

        <script type="text/javascript">

            var PassTest = function()

                document.getElementById("testresult").firstChild.data = "PASS";

            var FailTest = function()

                document.getElementById("testresult").firstChild.data = "FAIL";

            function DisableZooming()

                BEFORE = HELPER.getBoundingClientRect().width;

                DisableZoom = true;

            function VerifyResult()

                AFTER = HELPER.getBoundingClientRect().width;

                if ((true == DisableZoom) && (true == TestResult) && (BEFORE == AFTER))

                    PassTest();

                else

                    FailTest();

            function TestEvent(evt)

                if ((true == DisableZoom) && (true == evt.ctrlKey) && (EVENT == evt.type))

                    evt.preventDefault();

                    TestResult = evt.defaultPrevented;

            var EVENT = "wheel";

            var TARGET;

            var HELPER;

            var BEFORE;

            var AFTER;

            var DisableZoom = false;

            var TestResult = false;

            window.onload = function()

try

                    TARGET = document;

                    HELPER = document.getElementById("helper");

                    TARGET.addEventListener(EVENT, TestEvent, true);

                catch(ex)

                    FailTest();

        </script>

    </head>

    <body>

        <h3>DOM Events</h3>

        <h4>

            Test Description: The typical default action of the wheel event type, in some cases,  is to

            zoom the document. If this event is canceled, the implementation must not zoom the document.

        </h4>

        <div id="helper" style="width:100%"></div>

        <p id="manualsteps">

            Steps:

            <ol>

                <li> Note: an input device with scroll wheel support (e.g., mouse wheel) is required

                <li> Make sure the page can be zoomed in/out by holding down '{CTRL}' key + scrolling the mouse wheel on the page

                <li> Now, click the button: <button id="verify" onclick="DisableZooming()">Disable Zooming</button>

                <li> Press and hold down '{CTRL}' key on the keyboard

                <li> Move the mouse pointer to the center of the page

                <li> Scroll down/up the mouse wheel some units

                <li> Click the button: <button id="verify" onclick="VerifyResult()">VerifyResult</button>

            </ol>

        </p>

        <p>Test passes if the word "PASS" appears below after following the above steps.</p>

        <div>Test result: </div>

        <div id='testresult'>FAIL</div>

    </body>

</html>