SVGs not scaling properly in IE - has extra space
On a side note to help anyone struggling to implement this fix or finding its not working with external svg files rather than in-page svg markup
You need to ensure that when editing your svg file in a text editor it is not missing viewBox or preserveAspectRatio attributes in the opening <svg> tag. If these are missing regardless of what fixes you apply the svg will still not scale in IE - even though it'll scale in other browsers without issue.
If these options are set you can define the width/height on the image element used to pull in the svg to 100% and use max-width or max-height to limit the scaling and it will perform as expected. Though - you could still get some alignment issues.
As you have discovered, IE has a bug where it doesn't scale the SVG properly if you don't provide both the width and height.
To get it working in IE, you can use a trick discovered (?) by Nicolas Gallagher.
http://nicolasgallagher.com/canvas-fix-svg-scaling-in-internet-explorer/
The trick uses a <canvas> element. IE does properly scale canvas elements. So if you place one in the <div> with the SVG, the SVG will end up the correct size. You just need to give the canvas the same aspect ratio as your SVG.
<div style="position:relative;width:100%;background:blue;">
<canvas width="254" height="108"></canvas>
<svg class="mys" viewBox="0 0 254 108" preserveAspectRatio="xMaxYMax meet">
<use xlink:href="#mys"></use>
</svg>
</div>
with CSS
canvas {
display: block;
width: 100%;
visibility: hidden;
}
svg {
position: absolute;
top: 0;
left: 0;
width: 100%;
}
canvas {
display: block;
width: 100%;
visibility: hidden;
}
svg {
position: absolute;
top: 0;
left: 0;
width: 100%;
}<svg style="display:none;">
<defs>
<symbol id="mys">
<path fill-rule="evenodd" clip-rule="evenodd" fill="#3F77BC" d="M222.1,77.7h-10.3c0.1-0.8,0.2-1.4,0.2-2.3
c0-8.5-6.9-15.4-15.4-15.4c-8.5,0-15.4,6.9-15.4,15.4c0,0.9,0.1,1.5,0.2,2.3h-9.3v4h-24.9v-5.2H89.4c0-0.3,0-0.6,0-0.9
C89.4,67.1,82.5,60,74,60s-15.4,6.9-15.4,15.4c0,0.3,0,0.6,0,0.9h-6.2V60.7h4.3l5.3-5.3h22.8L74.3,44.9l-13.5-3.6l0.5-1.7
l-16.5-4.4c-0.3,0.1-0.7,0.2-1,0.2l0,21.4h2v7.2c0,0-2,0.6-1.9,1.3c0.1,0.7,4.1,2.6,3.4,5.5c-0.6,2.9-1.6,4.8-4.4,4.5
c-2.7-0.3-3.4-1.4-3.4-2.6c-0.1-1.2,0-3,0-3L38,67.9c0,0,2-0.5,2.6,1.1c0.6,1.5-0.2,2.7,0.6,3.5c0.8,0.8,4.1,1.4,4.1-1.1
c0-2.5-0.5-2.4-2.1-3.6c-1.7-1.2-3.4-2.8-3.4-3.3c0-0.5-0.1-7.7-0.1-7.7h2.1l0-21.7c-1.4-0.7-2.5-2.1-2.5-3.8
c0-2.3,1.9-4.2,4.2-4.2c2,0,3.6,1.4,4.1,3.2l15.3,4.1l0.4-1.6l55.8,15.1h28.1c0,0,0-23.5,0-26.2c0-2.7,2.1-2.6,2.1-2.6
s32.5-0.5,35.1,0.5c2.7,1,3.3,3.7,3.3,3.7h-2l5,11.6c0,0,7.3,4.6,17.6,7.6c10.3,3,13.6,7.6,13.6,7.6l-1,17.6l1.3,2V77.7z
M81.5,46.8l8.6,8.6h9.3l2.9-2.9L81.5,46.8z M175.5,25l-17.4-0.1v12.6h9.6l2.7,2.7h6.6L175.5,25z M183,23.7h-4c0,0,2,6.6,3,9.9
s0.9,4.2,2.7,4.2c1.9,0,4.2,0,4.2,0L183,23.7z M74.2,63.8c6.8,0,12.3,5.5,12.3,12.3S81,88.4,74.2,88.4c-6.8,0-12.3-5.5-12.3-12.3
S67.4,63.8,74.2,63.8z M196.6,63.8c6.8,0,12.3,5.5,12.3,12.3s-5.5,12.3-12.3,12.3s-12.3-5.5-12.3-12.3S189.8,63.8,196.6,63.8z"/>
</symbol>
</defs>
</svg>
<div style="position:relative;width:100%;background:blue;">
<canvas width="254" height="108"></canvas>
<svg class="mys" viewBox="0 0 254 108" preserveAspectRatio="xMaxYMax meet">
<use xlink:href="#mys"></use>
</svg>
</div>The trick works whether you are trying to get it to match a width or a height.