Quick Reference
The box-sizing property defines how the width and height of an element are calculated (i.e., should they include padding and borders, or not).
div {
box-sizing: border-box;
}Default
| Default value | content-box |
| Inherited values | no |
| Can it be animated? | no |
These are the allowed values.
| Value | Description |
|---|---|
| content-box | The width and height properties (and min/max properties) includes only the content; border and padding are not included (default) |
| border-box | The width and height properties (and min/max properties) includes content, padding and border |
| initial | Sets this property to its default value |
| inherit | Inherits this property from its parent element |
Using JavaScript
The HTML element can also be styled using JavaScript and the element’s id.
document.getElementById('my_div').style.boxSizing = 'border-box';<button onclick='my_function()'>Click Here</button>
<script>
function my_function() {
document.getElementById('my_div').style.boxSizing = 'border-box';
}
</script>CSS Notes:
- The “inherit”, “initial” and “unset” keywords can be used with any CSS property to set its value
- In CSS there are many ways to express a color value in a property
We’d like to acknowledge that we learned a great deal of our coding from W3Schools and TutorialsPoint, borrowing heavily from their teaching process and excellent code examples. We highly recommend both sites to deepen your experience, and further your coding journey. We’re just hitting the basics here at 1SMARTchicken.