How Can I Precisely Control Dashed Border Stroke Length and Spacing in CSS?

Controlling Dashed Border Stroke Length and Distance

While CSS provides the border property to create dashed borders, it lacks customization options for controlling the length or distance between the strokes. This article explores alternative methods to achieve greater control over dashed border appearance.

Using border-image

The border-image property allows for the creation of custom borders by using an image as the source. Unlike border, border-image offers more flexibility in styling the border components, including the length and distance between dashes.

Creating the Image:

To create a custom dashed border image, you'll need to use an image editor like Photoshop. The image should have equal width and height, with the stroke length and gaps represented as transparent and opaque areas, respectively.

Implementing with CSS:

border-image: url("path_to_image.png") <border-image-width> <border-image-slice> <border-image-repeat>;

• border-image-width: Controls the width of the border image.
• border-image-slice: Specifies the thickness of the border's top, right, bottom, and left sides.
• border-image-repeat: Defines the pattern repetition behavior (e.g., round for even spacing).

Example:

.my-border {
  border-image: url("my_border_image.png") 2 round;
  border-style: dashed;
}

In this example, the my_border_image.png image has a stroke length of 2 pixels and gaps of 5 pixels. The border-style property is set to dashed to display the custom border.

Adjusting Stroke Length and Gaps

To adjust the stroke length and gaps, modify the image accordingly. For example, to create wider gaps, increase the transparent areas in the image. To lengthen the stroke, reduce the opaque areas in the image.

Compatibility

border-image is well-supported by modern browsers, including IE 11 and all major browsers. For older browsers, a fallback border property can be added to ensure compatibility.

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