How can I set the width and hight from this svg image? I don't get it.
<svg xmlns="http://www.w3.org/2000/svg" xmlns:xlink="http://www.w3.org/1999/xlink">
<path fill="none" stroke="#0074c4" d="M80,80 A80,80 0 1,180.61117636732928,100.45116865416591" stroke-width="3" />
</svg>
I tried it with the width and height attr., with the viewBox attr. and with a div around the svg (i read in some post that an svg image with no width and height is auto. 100%) but nothing works.
fiddle here http://jsfiddle.net/k38Bv/1/
The mistake you had is that you forgot to add the viewBox property. You need it because it's important for scaling. Here's what the object should be like:
<svg width="100%"
height="100%"
viewBox="0 0 300 150"
xmlns="http://www.w3.org/2000/svg" xmlns:xlink="http://www.w3.org/1999/xlink">
<path fill="none" style="-webkit-tap-highlight-color: rgba(0, 0, 0, 0);" stroke="#0074c4" d="M80,80 A80,80 0 1,180.61117636732928,100.45116865416591" stroke-width="3" />
</svg>