Simple trick to convert all SVG Polylines to Path so that they can be animated

after.svg

<?xml version="1.0" encoding="utf-8"?>
<!DOCTYPE svg PUBLIC "-//W3C//DTD SVG 1.1//EN" "http://www.w3.org/Graphics/SVG/1.1/DTD/svg11.dtd">
<svg version="1.1" id="Layer_1" xmlns="http://www.w3.org/2000/svg" xmlns:xlink="http://www.w3.org/1999/xlink" x="0px" y="0px" width="1000px" height="1000px" viewBox="0 0 1000 1000" enable-background="new 0 0 1000 1000" xml:space="preserve">
<path fill="#FFFFFF" stroke="#000000" stroke-miterlimit="10" d="M100.712,141.534 582.904,227.835 425.37,478.521
	711.671,552.493 345.918,810.027 900.713,859.343 "/>
</svg>

before.svg

Convert-SVG-Polyline-To-Path.md

Convert SVG polyline to path

Replace all instances of <polyline with <path and points=" with d="M.

 <?xml version="1.0" encoding="utf-8"?>
 <!DOCTYPE svg PUBLIC "-//W3C//DTD SVG 1.1//EN" "http://www.w3.org/Graphics/SVG/1.1/DTD/svg11.dtd">
 <svg version="1.1" id="Layer_1" xmlns="http://www.w3.org/2000/svg" xmlns:xlink="http://www.w3.org/1999/xlink" x="0px" y="0px" width="1000px" height="1000px" viewBox="0 0 1000 1000" enable-background="new 0 0 1000 1000" xml:space="preserve">
-<polyline fill="#FFFFFF" stroke="#000000" stroke-miterlimit="10" points="100.712,141.534 582.904,227.835 425.37,478.521
+<path fill="#FFFFFF" stroke="#000000" stroke-miterlimit="10" d="M100.712,141.534 582.904,227.835 425.37,478.521
 	711.671,552.493 345.918,810.027 900.713,859.343 "/>
 </svg>

To close the path, you can also add z before the closing ". E.g. 900.713,859.343z "/>.