- Tags: Border
- Categories: CSS Properties, CSS Reference, Reference
Quick Reference
The border-width property sets the width of an element’s borders. An element must have a border before you can change the width.
/* sets all 4 borders */
div {
border-width: 4px;
}
/* sets the top and bottom border to thick, and the left and right borders to thin */
div {
border-width: thick thin;
}
/* sets the top border to thin, the two side borders to medium, and the bottom border to 8px */
div {
border-width: thin medium 8px;
}
/* sets the top border to thin, the right side border to medium, the bottom border to 8px, and the left side border to 12px */
div {
border-width: thin medium 8px 4px;
}
Values
| Default value | none |
| Inherited values | no |
| Can it be animated? | no |
These are the allowed values.
| Value | Description |
|---|---|
| medium | Specifies a medium border (default) |
| thin | Specifies a thin border |
| thick | Specifies a thick border |
| length | Allows you to define the thickness of the border in pixels |
| 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.borderWidth = 'thin 4px';
<button onclick='my_function()'>Click Here</button>
<script>
function my_function() {
document.getElementById('my_div').style.borderWidth = 'thin 4px';
}
</script>
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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
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