Inkscapeでエクスポートしたsvgが表示されない？（viewBoxの異常値）

InkscapeでエクスポートしたSVGファイルの表示されない場合、viewBoxの値や transformの設定がおかしいのかもしれません。
「ドキュメントのプロパティ」でページサイズを適切に設定してから、エクスポートし直すと正しい SVGファイルになります。

1. エクスポートしたsvgが表示されない？

InkscapeでエクスポートしたSVGが表示されないことがあります。
何が原因ですか？

問題のSVGファイルのXMLを見ると、viewBoxやtranslate の値が異常に大きな値になっていました。

viewBox="0 0 341227.19 345126.41"
transform="translate(-40505.039,-39739.68)"

empty.svg
Attribution：Apple Vectors by Vecteezy ダウンロード

SVGのXML

「SVG（Scalable Vector Graphics）」は、ベクターグラフィックス形式がXMLで書かれています。
そのため、テキストエディタで開いて中身を確認できます。

<?xml version="1.0" encoding="UTF-8"?>
<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 512 512">
  <!-- 図形の定義 -->
  <rect x="0" y="0" width="100" height="100"/>
  <circle cx="50" cy="50" r="40"/>
  <!-- その他の要素 -->
</svg>

empty.svg

<?xml version="1.0" encoding="UTF-8" standalone="no"?>
<svg
   viewBox="0 0 337350 341062.75"
   version="1.1"
   id="svg2"
   width="337350"
   height="341062.75"
   xmlns="http://www.w3.org/2000/svg"
   xmlns:svg="http://www.w3.org/2000/svg">
  <defs
     id="defs2">
    <linearGradient
       id="linear-gradient"
       x1="325"
       y1="581"
       x2="325"
       y2="69"
       gradientUnits="userSpaceOnUse">
      <stop
         offset="0"
         stop-color="#2274bb"
         id="stop1" />
      <stop
         offset="1"
         stop-color="#05bbee"
         id="stop2" />
    </linearGradient>
  </defs>
  <title
     id="title2">IOS7_App_Icon_Grid</title>
  <g
     id="Grid_App_Icon"
     data-name="Grid App Icon"
     transform="translate(-42575,-42299.148)">
    <rect
       id="back"
       x="69"
       y="69"
       width="512"
       height="512"
       rx="122.18"
       ry="122.18"
       fill="url(#linear-gradient)"
       style="fill:url(#linear-gradient)" />
    <path
       d="M 582.58,458 V 325.73 H 583 v -1.46 h -0.42 V 192 a 124.94,124.94 0 0 0 -35.2,-86.9 v -2.4 h 35.2 v -1.47 H 548.4 l 32.82,-33 -1,-1 -32.81,33 V 67.94 h -1.46 v 33.29 h -2.48 A 123.51,123.51 0 0 0 458.2,67 H 191.37 a 123.51,123.51 0 0 0 -85.23,34.23 h -2.49 V 67.94 h -1.45 v 32.26 l -32.81,-33 -1,1 32.81,33 H 69.08 v 1.46 h 33.12 v 2.44 A 124.91,124.91 0 0 0 67,192 v 266 a 124.91,124.91 0 0 0 35.2,86.9 v 2.44 H 69.08 v 1.46 h 32.09 l -32.81,33 1,1 32.81,-33 v 32.26 h 1.45 v -33.29 h 2.49 A 123.51,123.51 0 0 0 191.37,583 H 458.2 a 123.51,123.51 0 0 0 85.24,-34.23 h 2.48 v 33.29 h 1.46 V 549.8 l 32.81,33 1,-1 -32.82,-33 H 583 v -1.46 h -35.62 v -2.44 a 125,125 0 0 0 35.2,-86.9 z m -1.46,0 a 123.41,123.41 0 0 1 -33.74,84.78 V 417.45 H 580.6 V 416 h -33.22 v -90.27 h 33.74 z m -164.79,-42 -1,-1 q 2.49,-2.53 4.83,-5.2 v 6.2 z m 3.83,1.46 v 2.39 l -2.38,-2.39 z M 230.25,416 v -5.25 c 1.3,1.45 2.64,2.86 4,4.25 l -1,1 z m 1.55,1.46 -1.55,1.54 v -1.55 z m 1.45,-183.46 1,1 c -1.36,1.39 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1.61,-1.85 3.28,-3.66 5.01,-5.41 z m -6.48,88.22 h -29.87 a 126.35,126.35 0 0 1 29.87,-81.11 z m 0,1.46 v 81.11 a 126.35,126.35 0 0 1 -29.87,-81.11 z m 1.45,0 h 2.59 a 92.31,92.31 0 0 0 26.42,64.11 l -24,24.11 c -1.73,-1.75 -3.4,-3.56 -5,-5.41 z m 6.06,89.32 24,-24.11 A 91.61,91.61 0 0 0 308.57,416 h -71.24 z m 87.75,2.46 v 34.08 a 125,125 0 0 1 -85.2,-34.08 z m 1.46,0 h 85.2 a 125.07,125.07 0 0 1 -85.2,34.08 z M 341,416 a 91.54,91.54 0 0 0 48.29,-25.11 l 24,24.11 -1,1 z m 73.3,-2 -24,-24.11 a 92.39,92.39 0 0 0 26.42,-64.11 h 3.42 v 81.85 q -2.8,3.24 -5.84,6.37 z m 7.31,-88.22 h 29 a 126.35,126.35 0 0 1 -29,80.12 z m 30.49,-1.46 A 127.81,127.81 0 0 0 421.61,241.94 V 234 h 76.9 a 196.83,196.83 0 0 1 22.13,90.26 z M 421.61,232.6 v -3.86 l 42.18,-42.39 a 197.46,197.46 0 0 1 33.95,46.25 z m 0,-5.92 v -72.86 a 196.59,196.59 0 0 1 41.15,31.44 z m -1.45,1.46 -4.43,4.46 h -2.89 A 126.53,126.53 0 0 0 325.52,197 V 128.12 A 194.06,194.06 0 0 1 420.16,153 Z M 324.06,197 a 126.51,126.51 0 0 0 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       fill="#8cd6f1"
       id="path2"
       style="stroke:#dfdfdf;stroke-width:3;stroke-dasharray:none;stroke-opacity:1" />
  </g>
</svg>

（参考）