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<style>
svg {
outline: 1px solid red;
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<stop offset="1" stop-color="black" />
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<use href="#mask-content" />
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<image href="https://webdav.iflyit.top/share/图片/city-shanghai-1.jpg" />
<use href="#mask-shape" x="33.3333%" width="33.3333%" />
<image x="66.6666%" href="https://webdav.iflyit.top/share/图片/city-shanghai-1.jpg" mask="url(#myMask)" />
<text x="33.3333%" y="50%" text-anchor="middle" font-size="60" fill="red"> + </text>
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