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chromium/third_party/blink/web_tests/dark-mode/images/gradient.html 

<!DOCTYPE html>
<style>
  .gradient {
    background-image: linear-gradient(white 0%, blue 100%);
    width: 400px;
    height: 200px;
  }
  .gradient_shader {
    background-image: linear-gradient(white 0%, blue 100%);
    width: 400px;
    height: 200px;
    border-radius:0 0.5rem 0.5rem 0;
  }
</style>
<div class="gradient"></div>
<div class="gradient_shader"></div>
<svg xmlns="http://www.w3.org/2000/svg" version="1.1">
    <defs>
        <linearGradient id="linearGradient" x1="0%" y1="0%" x2="0%" y2="100%">
            <stop offset="0" style="stop-color:white"></stop>
            <stop offset="1" style="stop-color:blue"></stop>
        </linearGradient>
    </defs>
    <rect width="400" height="200" fill="url(#linearGradient)" />
</svg>