opacity: 0.5; filter: alpha(opacity=50); /* sử dụng cho IE8 trở về trước */ }
Transparency of images
The smaller the opacity attribute value, the more transparency.
Image with 80% opacity transparent:
Transparent effect when dragging
The opacity attribute is often used with : hover to change the transparency of the image when hovering over.
img { opacity: 0.5; filter: alpha(opacity=50); /* sử dụng cho IE8 trở về trước */ }
img:hover { opacity: 1.0; filter: alpha(opacity=100); /* sử dụng cho IE8 trở về trước */ }
For example:
Transparency of images
The opacity attribute is often used with: hover to change transparency of the image when hovering over.
In the above example, the first CSS fragment is similar to the code in example 1 and adds the effect when the user moves the mouse over one of the images, the image becomes clear. Also, you can leave the original image with the clear opacity of 1.0 by default, after hovering over, the image will fade as follows:
Transparency of images
The opacity attribute is often used with: hover to change transparency of the image when hovering over.
Transparent Box
When using the opacity attribute to add opacity to an element's background, all child elements will inherit that opacity. This makes the text inside the element with high opacity difficult to read:
div { opacity: 0.3; filter: alpha(opacity=30); /* sử dụng cho IE8 trở về trước */ }
Transparent Box uses RGBA
If you don't want to apply opacity to child elements like in the example above, you can use RGBA color values. For example, just set the opacity for the background color, not set for text:
div { background: rgba(128, 0, 128, 0.3) /* Nền màu tím với 30% opacity */ }
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the ruler consists of vertical and horizontal ruler. the vertical ruler shows the cursor position corresponding to the x axis on the property bar, the horizontal ruler shows the cursor corresponding to the y axis on the property bar.