SVG:title要素
t.svg<svg viewBox="0 0 20 10" xmlns="http://www.w3.org/2000/svg">
<circle cx="5" cy="5" r="4">
<title>I'm a circle</title>
</circle>
<rect x="11" y="1" width="8" height="8">
<title>I'm a square</title>
</rect>
</svg>t.svg<svg viewBox="0 0 20 10" xmlns="http://www.w3.org/2000/svg">
<circle cx="5" cy="5" r="4">
<title>I'm a circle</title>
</circle>
<rect x="11" y="1" width="8" height="8">
<title>I'm a square</title>
</rect>
</svg>