So, if you use an image tag like:
This will work as long as the both the image and the page are on www.mysite.com
update: it will also work fine on your own machine and within RapidWeaver preview (thanks Joe).
If you do need to warehouse your files on another domain you can use the
<object> tag instead of the
<img> tag. Objects are contained in their own little sandbox so they don't have the same limitation. So something like this should always work:
<object data="http://my.site.com/path/to/images/my_image.svg" type="image/svg+xml"></object>
There are, of course, other limitations of the
<object> tag. It's slower. It eats a bit of memory. And it can't be styled with CSS in nice ways that an
<img> tag can.