How can I partially fill an SVG shape using filters and animation?

Outlining and Partially Filling SVG Shapes

Stroking an SVG Star's Outline

In your SVG star example, the outer stroke is applied to every line of the star, including those that form the inner shape. To only stroke the outside of the star, define a separate path for the outline:

<svg height="210" width="500">
 <polygon points="100,10 40,198 190,78 10,78 160,198" 
  >

Partially Filling an SVG Star Shape

To partially fill an SVG shape, you can use a filter effect. Here's a filter that animates the fill from top to bottom:

<svg height="210" width="500">
 <defs>
  <filter>

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