CSS blend modes is a color blending effect achieved through the mix-blend-mode and background-blend-mode properties. 1. mix-blend-mode is suitable for the entire element and its content; 2. background-blend-mode only affects the background layers. It is common in scenes such as image overlay, text and background fusion, such as text penetration, background texture fusion, and button highlighting effects. When using it, you need to pay attention to the effects of performance, browser compatibility and color mode. Debugging can be modified and observed in real time through developer tools.

CSS blend modes can make web pages more visually rich, especially in scenes such as image overlay, text and background fusion. They are not only used in design software like traditional layer mixing, but can be implemented directly through CSS.

What are CSS blend modes?

mix-blend-mode and background-blend-mode of CSS are two main properties that control how elements are colored with the content below.

• mix-blend-mode : works on the entire element, including its content and background.
• background-blend-mode : only affects the background layers of the elements.

For example, when you set mix-blend-mode: multiply; for a div with a background image, this div will "fusion" with the elements below it, producing an effect similar to that in Photoshop.

Common usage scenarios

1. Image overlay text : It can create the effect of text penetrating pictures, which is commonly found in modern website title areas.
2. Background Fusion : Using different blend modes between multiple background layers can create a unique texture or atmosphere.
3. Button/icon highlight effect : Use simple gradients to add a brightness to enhance interaction.

For example: you have a dark background and a light-colored image. If you want the image to look "embedded" in the background, you can try mix-blend-mode: multiply; which will darken the color and blend in nature.

Things to note when using

• Performance issues : blend modes will affect rendering performance, especially when used too much on mobile or complex pages.
• Browser compatibility : Mainstream browsers basically support it, but IE doesn’t support it. If you need to be compatible with old browsers, you should consider downgrade solutions in advance.
• Effect of color mode : Different blend modes handle colors differently. For example, screen will brighten the color, while multiply will darken the color. It is recommended to try several more models to see which one is best for the current design goals.

You can start with these common values:

• normal
• multiply
• screen
• overlay
• darken
• lighten

How to debug blend mode effect?

The most direct method is to modify the value of mix-blend-mode or background-blend-mode in the browser developer tool in real time to observe changes. You can also temporarily add background-color or color to see the comparison before and after the fusion.

If you find that a blend mode does not have the expected effect, check whether the parent container has set isolation: isolate; . Some blend modes require the isolation context to be enabled for normal operation.

Basically that's it. If you use it too much, you will find that although CSS blend modes are simple, they can bring a lot of visual surprises if they are well matched.

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