Hi,

I just started using Polymer. It's great and easy to pick up. My first 
element is a grouped checkbox. Like ones that exist in native platforms. 
There is a "select all" checkbox that select all options. 

Here is my element: 
http://jsbin.com/cogowopu/1/edit

I have three questions:

1. Is it recommended to use native HTML elements in our elements? If so, 
how we can make a modified version of them? In this case, I need a checkbox 
that supports "some checked" statue. (usually a solid square inside of it). 
I want to use the CSS that defines checkbox appearance so I can make my 
modified version looks like native ones in each platform. Where can I get 
that CSS?

2. Why event.target is replaced with event.srcElement? What is event.target 
now?

3. How can I avoid using "that"?

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