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chromium/third_party/blink/web_tests/fast/forms/checkbox/checkbox-appearance-basic.html 

<!DOCTYPE html>
<meta name=fuzzy content="maxDifference=0-3; totalPixels=0-100">
<body>
<style>
input {
    margin: 4px;
}
</style>

<!-- no style for reference -->
<input type="checkbox">
<input type="checkbox" checked>
<br>

<!-- border -->
<input type="checkbox" style="border: 3px solid lime;">
<input type="checkbox" style="border-radius: 6px;"> <br>

<!-- background -->
<input type="checkbox" style="background: linear-gradient(to bottom, #dea 0%,#9c7 44%,#494 100%);"> <br>

<!-- shadow -->
<input type="checkbox" style="box-shadow: 4px 4px 10px rgba(255,0,0,0.5), inset 4px 4px 4px rgba(0,255,0,0.5);"> <br>

<!-- size -->
<input type="checkbox" style="width: 8px; height; 8px;">
<input type="checkbox" style="width: 16px; height; 16px;">
<input type="checkbox" style="width: 24px; height; 24px;"> <br>

<!-- zoom -->
<input type="checkbox" style="zoom: 1.5;" id="zoomed15">
<input type="checkbox" style="zoom: 2;"> <br>
<script>
document.querySelector('#zoomed15').focus();
</script>
</body>