我使用包含html的外来对象创建了SVG。
但是html不可见。
可能是什么原因？
<svg
width="160mm"
height="297mm"
viewBox="0 0 160 297"
version="1.1"
id="svg8"
inkscape:version="0.92.3 (2405546,2018-03-11)"
sodipodi:docname="aligned.svg">
<defs
id="defs2" />
<g
inkscape:label="Ebene 1"
inkscape:groupmode="layer"
id="layer1">
<rect
style="opacity:1;fill:#00ff09;fill-opacity:1;fill-rule:nonzero;stroke:none;stroke-width:0.26499999;stroke-linecap:butt;stroke-linejoin:miter;stroke-miterlimit:4;stroke-dasharray:none;stroke-opacity:1"
id="rect10"
width="30.994047"
height="27.214285"
x="9.8273811"
y="89.491081" />
<rect
style="opacity:1;fill:#00ff09;fill-opacity:1;fill-rule:nonzero;stroke:none;stroke-width:0.26499999;stroke-linecap:butt;stroke-linejoin:miter;stroke-miterlimit:4;stroke-dasharray:none;stroke-opacity:1"
id="rect12"
width="9.8273811"
height="76.351196"
x="57.452377"
y="64.922623" />
<ellipse
style="opacity:1;fill:#00ff09;fill-opacity:1;fill-rule:nonzero;stroke:none;stroke-width:0.26499999;stroke-linecap:butt;stroke-linejoin:miter;stroke-miterlimit:4;stroke-dasharray:none;stroke-opacity:1"
id="path14"
cx="114.52679"
cy="103.09822"
rx="17.008928"
ry="19.276785" />
<rect
style="opacity:1;fill:#378a3a;fill-opacity:1;fill-rule:nonzero;stroke:none;stroke-width:0.26499999;stroke-linecap:butt;stroke-linejoin:miter;stroke-miterlimit:4;stroke-dasharray:none;stroke-opacity:1"
id="rect35"
width="170.08928"
height="8.3154764"
x="3.4017856"
y="98.940483" />
</g>
<foreignObject width="100" height="50" requiredextensions="http://www.w3.org/1999/xhtml">
<div x="50" y="100" width="300" height="300" xmlns="http://www.w3.org/1999/xhtml">
I want to see this text.
##############################
#####################
</div>
</foreignObject>
</svg>
我使用了这个来源：https://wiki.selfhtml.org/wiki/SVG/Elemente/eingebundene_Inhalte/foreignObject使用了“ requiredextensions”。