chromium/chrome/browser/resources/lens/overlay/overlay_shimmer_canvas.html

<style>
  :host {
    height: 100%;
    width: 100%;
  }

  #shaderCanvas {
    height: 100%;
    width: 100%;
  }

  #sparklesImgContainer {
    display: none;
  }
</style>
<canvas id="shaderCanvas"
    style$="height: [[canvasHeight]]px; width: [[canvasWidth]]px;"></canvas>
<!-- Provides image source for canvas; element is not displayed. -->
<div id="sparklesImgContainer">
  <image id="sparklesSvg" src="sparkles.svg" on-load="onSparklesLoad">
</div>