Its web development software from the 90s/00s, a period when websites were built by first having a designer meticulously mock everything up in Photoshop on a 640x480 canvas (maybe 800x600 or 1024x768 in later days), that mockup would then be handed over to a web developer (hi, that was me) who would take that mockup, slice it up into a billion little images, and then put them in a wildly complex set of nested HTML tables. The designer would then have a look over it and provide critique on the fact some element was 3px misaligned, or the font size was incorrect.

During this period I was berated by our studio lead for using new fangled technologies like CSS layout that could adapt to different sized screens instead of sticking to the trusty HTML soup Dreamweaver would spit out.