stroke-linecap

The stroke-linecap CSS property defines the shape to be used at the end of open subpaths of SVG elements' unclosed strokes. If present, it overrides the element's stroke-linecap attribute.

This property applies to any SVG shape that can have unclosed strokes and text-content element (see stroke-linecap for a full list), but as an inherited property, it may be applied to elements such as <g> and still have the intended effect on descendant elements' strokes.

Syntax

css
/* keyword values */
stroke-linecap: butt;
stroke-linecap: round;
stroke-linecap: square;

/* Global values */
stroke-linecap: inherit;
stroke-linecap: initial;
stroke-linecap: revert;
stroke-linecap: revert-layer;
stroke-linecap: unset;

Values

butt

Indicates that the stroke for each subpath does not extend beyond its two endpoints. On a zero-length subpath, the path will not be rendered at all. This is the default value.

round

Indicates that at the end of each subpath the stroke will be extended by a half circle with a diameter equal to the stroke width. On a zero-length subpath, the stroke consists of a full circle centered at the subpath's point.

square

Indicates that at the end of each subpath the stroke will be extended by a rectangle with a width equal to half the width of the stroke and a height equal to the width of the stroke. On a zero-length subpath, the stroke consists of a square with its width equal to the stroke width, centered at the subpath's point.

Formal definition

Initial valuebutt
Applies to<circle>, <ellipse>, <line>, <path>, <polygon>, <polyline>, and <rect> elements in an svg
Inheritedyes
Computed valueas specified
Animation typediscrete

Formal syntax

stroke-linecap = 
  butt    |
  round   |
  square

Examples

Linecaps

This example demonstrates the property's three keyword values.

HTML

We first set up a light-gray rectangle. Then, in a group, three paths are defined whose length is exactly the same as the width of the rectangle, and all of which start at the left edge of the rectangle. They are all set to have a dodgerblue stroke with a width of seven.

html
<svg viewBox="0 0 100 50" width="500" height="250">
  <rect x="10" y="5" width="80" height="30" fill="#DDD" />
  <g stroke="dodgerblue" stroke-width="7">
    <path d="M 10,10 h 80" />
    <path d="M 10,20 h 80" />
    <path d="M 10,30 h 80" />
  </g>
</svg>

CSS

We then apply a different linecap style to each path via CSS.

css
path:nth-of-type(1) {
  stroke-linecap: butt;
}
path:nth-of-type(2) {
  stroke-linecap: square;
}
path:nth-of-type(3) {
  stroke-linecap: round;
}

Results

The first path has butt linecaps, which essentially means the stroke runs exactly to the end points (both the start and the end) of the path, and no further. The second path has square linecaps, so the visible path extends out past the end points of the path, making the overall length of the path appear to be 87, since the path length is 80 and each of the two square caps is 3.5 wide. The third path has circle caps, so while it also appears to be 87 units long, the two caps are semicircular instead of square.

Specifications

Specification
CSS Fill and Stroke Module Level 3
# stroke-linecap

Browser compatibility

BCD tables only load in the browser

See also