From: Bruce Lawson [] 
Sent: 13 June 2015 14:57
Subject: Re: Custom Elements: is=""

On 12 June 2015 at 21:26, Tobie Langel <> wrote:
> I'm also concerned developers will mistakenly write:
>     <my-button is=button>
> As it is much closer in form to what they want to achieve (see the 
> extend=parent syntax I wrote earlier).

That's true (and I've done exactly this myself). But wouldn't

<button extendedby="my-button">

solve that?

I think the problem with this would be that it still turns the expected X 
extends Y convention on its head? It also appears as though the attributes 
relate to <button> rather than the element indicated in the extendedby= 


Léonie Watson - Senior accessibility engineer
@LeonieWatson @PacielloGroup

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