The read-only HTMLImageElement property y indicates the y-coordinate of the <img> element's top border edge relative to the root element's origin.
The x and y properties are only valid for an image if its display property has the computed value table-column or table-column-group. In other words: it has either of those values set explicitly on it, or it has inherited it from a containing element, or by being located within a column described by either <col> or <colgroup>.
Syntax
let imageY = htmlImageElement.y;
Value
An integer value indicating the distance in pixels from the top edge of the element's nearest root element to the top edge of the <img> element's border box. The nearest root element is the outermost <html> element that contains the image. If the image is in an <iframe>, its y is relative to that frame.
In the diagram below, the top border edge is the top edge of the blue padding area. So the value returned by y would be the distance from that point to the top edge of the content area.
Note: The y property is only valid if the computed value of the image's display property is either table-column or table-column-group; in other words, either of those are set directly on the <img> or they're inherited from a containing element or by being located within a column described by either <col> or <colgroup>.
Example
The example below demonstrates the use of the HTMLImageElement properties x and y.
HTML
In this example, we see a table showing information about users of a web site, including their user ID, their full name, and their avatar image.
<table id="userinfo">
<colgroup>
<col span="2" class="group1">
<col>
</colgroup>
<tr>
<th>UserID</th>
<th>Name</th>
<th>Avatar</th>
</tr>
<tr>
<td>12345678</td>
<td>Johnny Rocket</td>
<td><img src="https://udn.realityripple.com/samples/d6/7ab36d79bb.jpg"</td>
</th>
</table>
<pre id="log">
</pre>
JavaScript
The JavaScript code that fetches the image from the table and looks up its x and y values is below.
let logBox = document.querySelector("pre");
let tbl = document.getElementById("userinfo")
let log = msg => {
logBox.innerHTML += `${msg}<br>`;
}
let cell = tbl.rows[1].cells[2];
let image = cell.querySelector("img");
log(`Image's global X: ${image.x}`);
log(`Image's global Y: ${image.y}`);
This uses the <table>'s rows property to get a list of the rows in the table, from which it looks up row 1 (which, being a zero-based index, means the second row from the top). Then it looks at that <tr> (table row) element's cells property to get a list of the cells in that row. The third cell is taken from that row (once again, specifying 2 as the zero-based offset).
From there, we can get the <img> element itself from the cell by calling querySelector() on the HTMLTableCellElement representing that cell.
Finally, we can look up and display the values of the HTMLImageElement's x and y properties.
CSS
The CSS defining the appearance of the table:
.group1 {
background-color: #d7d9f2;
}
table {
border-collapse: collapse;
border: 2px solid rgb(100, 100, 100);
font-family: sans-serif;
}
td, th {
border: 1px solid rgb(100, 100, 100);
padding: 10px 14px;
}
td > img {
max-width: 4em;
}
Result
The resulting table looks like this:
Specifications
| Specification | Status | Comment |
|---|---|---|
| CSS Object Model (CSSOM) View Module The definition of 'HTMLImageElement.y' in that specification. |
Working Draft |
Browser compatibility
| Desktop | Mobile | |||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|
y | Chrome Full support 1 | Edge Full support 12 | Firefox
Full support
14
| IE No support No | Opera Full support Yes | Safari Full support Yes | WebView Android Full support Yes | Chrome Android Full support Yes | Firefox Android
Full support
14
| Opera Android Full support Yes | Safari iOS Full support Yes | Samsung Internet Android Full support Yes |
Legend
- Full support
- Full support
- No support
- No support