Question : HTML 5: canvas

Are there some experts in this forum has experience of HTML 5: canvas? My target is as follows:

Minimum requirement
1) draw sequence diagram. Which is doable by canvas. See above link.

Advanced Requirement:

2) I want to drag and drop class diagram, and draw sequence via mouse by end user.  This feature is similar to UML tool drawing sequence diagram.  

My question is HTML canvas could be selected to implement 2) requirement? In 2) requirement, class and line(sequence) needs to know when it is selected, and the movement of the mouse.

Answer : HTML 5: canvas

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