revision:
The width attribute specifies the width of the element, in pixels.
The width attribute can be used on the following elements: <canvas>, <embed>, <iframe>, <img>, <input>, <object>, <video>.
For input elements, the width attribute is used only with <input type="image">.
<element width="pixels"></element>
pixels: the width in pixels (e.g. width="100")
<canvas id="myCanvas" width="200" height="200" style="margin-left:3vw;border:1px solid">
Your browser does not support the HTML5 canvas tag.
</canvas>
<script>
var c = document.getElementById("myCanvas");
var ctx = c.getContext("2d");
ctx.fillStyle = "#92B901";
ctx.fillRect(50, 50, 100, 100);
</script>
<form style="margin-left:3vw;" action="/action_page.php">
<label for="fname">First name:</label>
<input type="text" id="fname" name="fname"><br><br>
<label for="lname">Last name:</label>
<input type="text" id="lname" name="lname"><br><br>
<input type="image" src="../../pics/submit.gif" alt="Submit" width="24" height="24">
</form>