CSS-Tricks:

A Trick That Makes Drawing SVG Lines Way Easier

When drawing lines with SVG, you often have a <path> element with a stroke. You set a stroke-dasharray that is as long as the path itself, as well as a stroke-offset that extends so far that you that it's initially hidden. Then you animate the stroke-offset back to 0 so you can watch it "draw" the shape.

Figuring out the length of the path is the trick, which fortunately you can do in JavaScript by selecting the path and …..

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