js display svg real size code example

Example: svg aspect ratio

<svg viewBox="-1 -1 162 92" xmlns="http://www.w3.org/2000/svg">
  <defs>
     <path id="smiley" d="M50,10 A40,40,1,1,1,50,90 A40,40,1,1,1,50,10 M30,40 Q36,35,42,40 M58,40 Q64,35,70,40 M30,60 Q50,75,70,60 Q50,75,30,60" />
  </defs>

  <!-- (width>height) meet -->
  <svg preserveAspectRatio="xMidYMid meet"  x="0"   y="0"  viewBox="0 0 100 100" width="20"  height="10"><use href="#smiley" /></svg>
  <svg preserveAspectRatio="xMinYMid meet"  x="25"  y="0"  viewBox="0 0 100 100" width="20"  height="10"><use href="#smiley" /></svg>
  <svg preserveAspectRatio="xMaxYMid meet"  x="50"  y="0"  viewBox="0 0 100 100" width="20"  height="10"><use href="#smiley" /></svg>

  <!-- (width>height) slice -->
  <svg preserveAspectRatio="xMidYMin slice" x="0"   y="15" viewBox="0 0 100 100" width="20"  height="10"><use href="#smiley" /></svg>
  <svg preserveAspectRatio="xMidYMid slice" x="25"  y="15" viewBox="0 0 100 100" width="20"  height="10"><use href="#smiley" /></svg>
  <svg preserveAspectRatio="xMidYMax slice" x="50"  y="15" viewBox="0 0 100 100" width="20"  height="10"><use href="#smiley" /></svg>

  <!-- (width<height) meet -->
  <svg preserveAspectRatio="xMidYMin meet"  x="75"  y="0"  viewBox="0 0 100 100" width="10"  height="25"><use href="#smiley" /></svg>
  <svg preserveAspectRatio="xMidYMid meet"  x="90"  y="0"  viewBox="0 0 100 100" width="10"  height="25"><use href="#smiley" /></svg>
  <svg preserveAspectRatio="xMidYMax meet"  x="105" y="0"  viewBox="0 0 100 100" width="10"  height="25"><use href="#smiley" /></svg>

  <!-- (width<height) slice -->
  <svg preserveAspectRatio="xMinYMid slice" x="120" y="0"  viewBox="0 0 100 100" width="10"  height="25"><use href="#smiley" /></svg>
  <svg preserveAspectRatio="xMidYMid slice" x="135" y="0"  viewBox="0 0 100 100" width="10"  height="25"><use href="#smiley" /></svg>
  <svg preserveAspectRatio="xMaxYMid slice" x="150" y="0"  viewBox="0 0 100 100" width="10"  height="25"><use href="#smiley" /></svg>

  <!-- none -->
  <svg preserveAspectRatio="none"           x="0"   y="30" viewBox="0 0 100 100" width="160" height="60"><use href="#smiley" /></svg>
</svg>

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