The most commonly used JavaScript effect on the Web is the image rollover. For the one person with access to the Web who’s never seen one before, an image rollover happens when you move your cursor ...

Today we’re going to take a look at writing scripts for the Greasemonkey add-on for Firefox. This add-on allows us to use JavaScript to make changes to the way webpages are displayed on our browser.

Google can index JS-loaded images when properly configured. Check rendered HTML in Search Console to diagnose why images aren't appearing. Update XML sitemaps and add alt text to maximize JS image ...