Dreamweaver CS6 made a change in code generation of attributes for tags in favor of using CSS. Once such example is the “img” tag from which the following attributes were removed.
The below screenshot will give you an idea of the changes made from Dreamweaver CS5.5 to CS6.0
Img tag attributes deprecated
These attributes have been deprecated in HTML 4.0 as mentioned by W3C here and have been marked as Obsolete here
A quick look at the img tag at W3Schools will give an idea of the deprecated attributes for img tag.
If you have not already checked up your Adobe Updater blinking in System Tray(Win) or Dock (Mac) for any Dreamweaver updates, do so right away. If you work with Business Catalyst sites, do it instantly!
Adobe Dreamweaver CS6 installed on your machine will receive this new update and address the performance issues reported by users of BC. When you click on the “Get Started” button in Business Catalyst panel within Dreamweaver, you might be seeing a progress bar for a very long time.
While the progress bar shows up, it may not let you work with the complete application. This has been fixed with the progress bar going away much much faster than earlier.
There were few customer reports (http://forums.adobe.com/message/4392653) of icons going missing in files panel after the release of OSX Lion version 10.7.3. It was something which we investigated and worked with Apple to identify the issue and resolve it.
The update of 10.7.4 went live a few weeks ago and it was expected to fix the issue. The engineers have verified it internally and confirmed the fix. In the community also, there are no longer reports of the issue being raised anymore.
It is a good indication that Mac platform users, update to the latest available from Apple. So if you are running into such an issue, you should go ahead and launch Software Update installing the latest ones available in the list.