The :Checked Pseudo-Class

This demonstrates setting the height and width of all checked <input> elements:

HTML file: Displayed by browser:
<style>
input:checked {
    height: 50px;
    width: 50px;
}
</style>
<body>
<form action="">
  <input type="radio" checked="checked" value="male" name="gender"> Male <br /><br />
  <input type="radio" value="female" name="gender"> Female
<br /><br /><hr /><br />
  <input type="checkbox" checked="checked" value="Bike"> I have a bike <br /><br />
  <input type="checkbox" value="Car"> I have a car
</form>
</body>
Male

Female



I have a bike

I have a car

Every input type which is selected (or checked) is enlarged to 50 pixels by 50 pixels.

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