The height attribute on an <input> tag sets the height of the image input element.
The height is specified in pixels - without the ‘px‘ unit.
An <input> element of type image with a height attribute.
<form action="/tutorial/action.html">
<label for="firstname">First name</label><br />
<input type="text" id="firstname" name="firstname"><br />
<label for="lastname">Last name</label><br />
<input type="text" id="lastname" name="lastname"><br /><br />
<input type="image" src="/img/html/arrow.png" height="40" alt="Submit">
</form>
The height attribute specifies the height of the input element.
This attribute only applies to <input> elements of type image.
The height is specified in pixels -- without the 'px' unit.
Percentages (%) are not allowed, but most browsers do support it.
<input type="image" height="pixels">
| Value | Description |
|---|---|
| pixels | Height of the image in the input element in pixels. |
Here is when height support started for each browser:
 Chrome
|
1.0 | Sep 2008 |
 Firefox
|
16.0 | Oct 2012 |
 IE/Edge
|
1.0 | Aug 1995 |
 Opera
|
1.0 | Jan 2006 |
 Safari
|
1.0 | Jan 2003 |
