The image probably isn't loaded by that time. I mean, it's probably a couple milliseconds, if that, between when you assign that src and when you ask for the width and height.

JavaScript package offers a smarter way to serve hi-res images ... The image-set() function, which works in WebKit nightly builds and is under consideration by the W3C, looks like this: ...

Lots of high-res images can really spruce up a Web site. But they can also slow it down-- images are files, files use bandwidth, and bandwidth is directly related to wait times. It's time you get ...