How do I achieve perfect slicing for gradient borders using border-image-slice?

How Does Border-Image Work with Linear-Gradient?

Gradient borders add a unique touch to web elements, but understanding how border-image interacts with them can be puzzling.

Understanding Slicing for Gradients

In CSS, border-image-slice defines the slicing of a border image into nine regions. For gradient borders, the image size is equal to the element's size. If the border-image-width is not specified, the border-width is used to define the regions.

Calculating Border-Image-Slice for Gradients

To achieve the desired effect, border-image-slice should be equal to border-image-width (or border-width if not specified with a unit) in pixels.

Unitless Values

Unitless values in border-image-slice are considered pixel values.

Percentage Values

Percentage values in border-image-slice are resolved against the element's size.

Example

In your example, where border-image-slice is set to 80:

• The border is 5em wide, which translates to 80px.
• 80 in border-image-slice, being unitless, is treated as 80px.
• Since 80px is equal to the border width of 80px, the gradient will be sliced evenly across the border regions.

Visualization

[Image of Gradient Border Slicing]

In Summary

To achieve perfect slicing for gradient borders:

1. Set border-image-slice equal to border-image-width (or border-width).
2. For percentage values, ensure that the computed value equals the border width.
3. Use unitless values for pixel-based slicing.

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