the stroke-width attribute specifies the width of the outline on the current object. Its default value is 1. If a <percentage> is used, the value represents a percentage of the current viewport. If a value of 0 is used the outline will never be drawn.
As a presentation attribute, it also can be used as a property directly inside a CSS stylesheet
| Categories | Presentation attribute |
|---|---|
| Value | <length> | <percentage> | inherit |
| Animatable | Yes |
| Normative document | SVG 1.1 (2nd Edition) |
The following elements can use the stroke-width attribute
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https://developer.mozilla.org/en-US/docs/Web/SVG/Attribute/stroke-width