<!DOCTYPE html>
<meta charset=utf-8>
<title>img width/height - reference</title>
<style>
p { width: 50px; height: 50px; }
</style>
<p><img src=/images/green.png>
<p><img src=/images/green.png style="width: 10px">
<p><img src=/images/green.png style="height: 10px">
<p><img src=/images/green.png style="width: 10%">
<p><img src=/images/green.png style="height: 10%">