Quick Reference
The opacity property describes the transparency level, where 1 is opaque and 0 is transparent. Any value in between will give partial transparency. The following is 50% transparent.
div {
opacity: 0.5;
}Note
Opacity will affect anything within the element the property is applied to. For instance, as shown in the above example, if you have text inside an element with the opacity set low, the text opacity will also be affected.
Default
| Default value | 1 |
| Inherited values | no |
| Can it be animated? | yes |
These are the allowed values.
| Value | Description |
|---|---|
| number | Specifies the opacity from 0.0 (fully transparent) to 1.0 (fully opaque) |
| 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.opacity = '0.5';<button onclick='my_function()'>Click Here</button>
<script>
function my_function() {
document.getElementById('my_div').style.opacity = '0.5';
}
</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.