How does the `border-image-slice` property interact with linear gradients and border width?

How Does Border-Image Work with Linear-Gradient?

Slicing Process for Gradient Border Image

When working with a gradient border image, the border-image-slice property controls the slicing of the gradient. The value can be a number, which represents an edge offset in pixels or coordinates for vector images.

In the provided example:

border-image: repeating-linear-gradient(45deg, #000, #000 1.5%, transparent 1.5%, transparent 5%) 80;

The value 80 is not relative to the div's size. It's a pixel value that defines the size of the entire border image.

Correlation Between Border-Image-Slice and Border Width

The border width, defined by the border property, affects the appearance of the border image. As you mentioned, changing the border width alters the look of the border image. This is because the border-image-slice is calculated relative to the border width.

A unitless value for border-image-slice is considered as a pixel value. In your case, 80 is equivalent to 80px. And your border width is 5em or 5 * 16 = 80px. This means that each side of the border is 80px wide, and hence the 80px border-image-slice creates equal slices for each region of the border.

Conclusion

When using a gradient border image, choosing a border-image-slice value that results in slices equal to the size of the border regions ensures a desired visual effect. With a unitless value, the slice size is in pixels and correlates directly with the border width. By understanding this correlation, developers can effectively style border images with linear gradients.

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