From: Tobie Langel [] 
Sent: 12 June 2015 21:26

On Fri, Jun 12, 2015, at 19:41, Léonie Watson wrote:
> Is there a succinct explanation of why the is= syntax is disliked? The 
> info on the WHATWG wiki explains where is= breaks, but doesn’t offer 
> much on the syntax issue [1].


So in summary it's ugly, has a high cognitive load, doesn't express the 
developers intent (actually even expresses the opposite), is hard to spot when 
reading code, and is error prone.

Hope this helps. :)

It does, thank you.

At the risk of asking the obvious question, why not use the extends= syntax you 

<my-button extends="button" attributes>Push</my-button>

It follows the expected X extends Y convention, and makes it reasonably clear 
what the attributes have been applied to I think.


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