<canvas width="400" height="400" canvas_background="220" animate="false">

  <_

    c1="color(160, 120, 60)"

    c2="color(40, 160, 200)"

    x1="0"

    y1="0"

    x2="width"

    y2="0"

    repeat="UNTIL, y1 GREATER_THAN height"

    change="y1: y1 + 1, y2: y2 + 1"

  >

    <line stroke_color="lerp_color(c1, c2, y1 / height)"> </line>

  </_>

</canvas>

​