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Scott has been at Microsoft since 1993 and has helped define many early technologies. He worked on the first ActiveX Control, helped create the forms package in Microsoft Office, defined many web standards, and is now driving the architecture for Microsoft Gadgets and frameworks driving Windows Live.
As a program manager on the Internet Explorer team in the mid-90's, Scott not only defined DHTML but also created the CSS 2-D positioning specification, many of the form enhancements (e.g., LABEL, FieldSet) helping improve web-based form accessibility and usability, XML Data Islands, and much more. He wrote the original definitive guide to Dynamic HTML, Inside Dynamic HTML, published by Microsoft Press. Scott also invented the iframe html tag. It has been speculated that the tag name stands for the Isaacs Frame, although Scott has denied this. 
Scott is responsible for inventing the Widget architecture (originally called Gadgets) for Windows Live.
Today, Scott continues to drive the client architecture that runs Windows Live and MSN Services. MSN Hotmail, MSN Spaces, Windows Live, etc., all being built around his DHTML-based Gadget/Widget Architecture.
- "Scott Isaacs - MSN DHTML Foundation unveiled".
- Douglas Crockford (2010). The Metamorphosis of Ajax (mov) (Lecture) (in English). Event occurs at 29:30. Archived from the original on 07/18/2011. Retrieved 02/05/2012. "He also invented the iframe. You've heard of the iframe? The Isaacs frame? He says that's not why it's called the iframe, but I know better"