MouseEvent: layerY property
===========================

**Non-standard:** This feature is non-standard and is not on a standards track. Do not use it on production sites facing the Web: it will not work for every user. There may also be large incompatibilities between implementations and the behavior may change in the future.

 The **`MouseEvent.layerY`** read-only property returns the
 vertical coordinate of the event relative to the current layer.

 This property takes scrolling of the page into account, and returns a value relative to
 the whole of the document, unless the event occurs inside a positioned element, where
 the returned value is relative to the top left of the positioned element.

Value
-----

An integer value in pixels for the y-coordinate of the mouse pointer, when the mouse event fired.

Examples
--------


```html
<html lang="en">
  <head>
    <title>pageX\pageY & layerX\layerY example</title>

    <script>
 function showCoords(evt) {
 const form = document.forms.form\_coords;
 const parent\_id = evt.target.parentNode.id;
 form.parentId.value = parent\_id;
 form.pageXCoords.value = evt.pageX;
 form.pageYCoords.value = evt.pageY;
 form.layerXCoords.value = evt.layerX;
 form.layerYCoords.value = evt.layerY;
 }
 </script>

    <style>
 #d1 {
 border: solid blue 1px;
 padding: 20px;
 }

 #d2 {
 position: absolute;
 top: 180px;
 left: 80%;
 right: auto;
 width: 40%;
 border: solid blue 1px;
 padding: 20px;
 }

 #d3 {
 position: absolute;
 top: 240px;
 left: 20%;
 width: 50%;
 border: solid blue 1px;
 padding: 10px;
 }
 </style>
  </head>

  <body onmousedown="showCoords(event)">
    <p>To display the mouse coordinates please click anywhere on the page.</p>

    <div id="d1">
      <span>
        This is an un-positioned div so clicking it will return layerX/layerY
        values almost the same as pageX/PageY values.
      </span>
    </div>

    <div id="d2">
      <span>
        This is a positioned div so clicking it will return layerX/layerY values
        that are relative to the top-left corner of this positioned element.
        Note the pageX\pageY properties still return the absolute position in
        the document, including page scrolling.
      </span>

      <span>
        Make the page scroll more! This is a positioned div so clicking it will
        return layerX/layerY values that are relative to the top-left corner of
        this positioned element. Note the pageX\pageY properties still return
        the absolute position in the document, including page scrolling.
      </span>
    </div>

    <div id="d3">
      <form name="form\_coords" id="form1">
        <label for="parentId">Parent Element id: </label>
        <input type="text" name="parentId" size="7" /><br />
        <label for="pageXCoords">pageX: </label>
        <input type="text" name="pageXCoords" size="7" />
        <label for="pageYCoords">pageY: </label>
        <input type="text" name="pageYCoords" size="7" /><br />
        <label for="layerXCoords">layerX: </label>
        <input type="text" name="layerXCoords" size="7" />
        <label for="layerYCoords">layerY: </label>
        <input type="text" name="layerYCoords" size="7" />
      </form>
    </div>
  </body>
</html>
```

Specifications
--------------

*This property is not part of any specification.*

Browser compatibility
---------------------

BCD tables only load in the browser with JavaScript enabled. Enable JavaScript to view data.