"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: .25;" />
</svg>

<svg viewBox="0 0 140 50" xmlns="http://www.w3.org/2000/svg">
    <text y="20" xml:space="default">Default   spacing</text>
    <text y="40" xml:space="preserve" alignment-baseline="auto">Preserved   spacing</text>
</svg>

<svg v