This seems like it ought to be easy, but I'm just not getting something.
I want to make an HTML page containing a single SVG image that automatically scales to fit the browser window, without any scrolling and while preserving its aspect ratio.
For example, at the moment I have a 1024x768 SVG image; if the browser viewport is 1980x1000 then I want the image to display at 1333x1000 (fill vertically, centred horizontally). If the browser was 800x1000 then I want it to display at 800x600 (fill horizontally, centred vertically).
Currently I have it defined like so:
<body style="height: 100%">
<div id="content" style="width: 100%; height: 100%">
<svg xmlns="http://www.w3.org/2000/svg" version="1.1"
width="100%" height="100%"
viewBox="0 0 1024 768"
preserveAspectRatio="xMidYMid meet">
...
</svg>
</div>
</body>
However this is scaling up to the full width of the browser (for a wide but short window) and producing vertical scrolling, which isn't what I want.
What am I missing?
How about:
html, body { margin:0; padding:0; overflow:hidden }
svg { position:fixed; top:0; bottom:0; left:0; right:0 }
Or:
html, body { margin:0; padding:0; overflow:hidden }
svg { position:fixed; top:0; left:0; height:100%; width:100% }
I have an example on my site using (roughly) this technique, albeit with 5% padding all around, and using position:absolute instead of position:fixed:
http://phrogz.net/svg/svg_in_xhtml5.xhtml
(Using position:fixed prevents a very edge-case scenario of linking to a sub-page anchor on the page, and overflow:hidden can ensure that no scroll bars ever appear (in case you have extra content.)
来源：https://stackoverflow.com/questions/5643254/how-to-scale-svg-image-to-fill-browser-window