JavaScript-loaded images can be indexed, Google's Martin Splitt confirms. Learn common indexing issues and best practices to ensure your JS images appear in search. Google can index JS-loaded ...

But they can also slow it down-- images are files, files use bandwidth, and bandwidth is directly related to wait times ... So if you have JavaScript that swaps an image on mouseover, or changes ...

For your information, you need to block mainly two things – images and JavaScript. As many websites use JavaScript to load different content on a webpage, it is as crucial as blocking images.