Images Your browser inserts a placeholder image for every image on the page that it has not displayed yet. It's strange, but there is no way to control the order that images appear. Until an image or other object is displayed, you might see some text in the spot where the image or object will go. This text should describe the object or its use, especially if it is a link. Such descriptions are actually read out loud by software that reads a page to blind people.
Some people turn off the loading of images to move along faster.
The ALT text also appears in some browsers as a popup tip when the pointer hovers over the image or object. The browser stores all the files it receives on your hard drive in the browser's cache . On a return visit to a page, your browser will look in this folder to see if it already has what it needs to display the page. If it does, then the browser does not have to ask the web server for that material again. The page will display much faster on return visits.