<!-- Learn about this code on MDN: https://developer.mozilla.org/en-US/docs/Web/SVG/Attribute/fill-opacity -->
<svg viewBox="0 0 400 100" xmlns="http://www.w3.org/2000/svg">
<!-- Default fill opacity: 1 -->
<circle cx="50" cy="50" r="40" />
<!-- Fill opacity as a number -->
<circle cx="150" cy="50" r="40"
fill-opacity="0.7" />
<!-- Fill opacity as a percentage -->
<circle cx="250" cy="50" r="40"
fill-opacity="50%" />
<!-- Fill opacity as a CSS property -->
<circle cx="350" cy="50" r="40"
style="fill-opacity:0;" />
</svg>
CSS
html,body,svg { height:100% }
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