Invalid HTML Warnings and the Markup Validation Tool
Some HTML coding is incompatible with the Blackboard learning management system, and may prompt an Invalid HTML warning to be displayed. Copying and pasting text directly from Word documents or websites can create these conflicts, which may manifest as bizarre characters being displayed or the loss of drag-and-drop functionality. The previous solution for these scenarios was to copy text first into Notepad to strip out complex code, and then copying the text back into Blackboard. The Markup Validation tool can now remove incompatible HTML code for you automatically.