Quick Reference
The z-index property specifies the stack order of an element. An element with a greater stack order is always in front of an element with a lower stack order.
div {
z-index: 5;
}Note
Negative numbers can be used, which will send the element behind elements with a positive z-index occupying the same space. A z-index set to 0 is the same as the default, auto.
Default
| Default value | auto |
| Inherited values | no |
| Can it be animated? | yes |
These are the allowed values.
| Value | Description |
|---|---|
| auto | Sets the stack order equal to its parents (default) |
| number | Sets the stack order of the element; negative numbers are allowed, which will send the element underneath other elements taking up the same space |
| 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.zIndex = '5';<button onclick='my_function()'>Click Here</button>
<script>
function my_function() {
document.getElementById('my_div').style.zIndex = '5';
}
</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.