Styling and Listening for items in template Custom Element at Dart -

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I'm trying to create an equals example

The code I used is: < / P> 

  Expands square proto HTML element {Fixed last tag = 'X-Foo-in-template'; Factory prototype () = & gt; New element Tag (tag); Proto.created (): super.created () {// 1. Attach a shadow route on element var shadow = this.createShadowRoot (); // 2. Fill it with markup goodness var t = New TemplateElement (); T.ID = "SDTplatform". Inder HTML = "" "& lt; Style & gt; P {Color: Orange;}   p> I am in the Shadow Dome. My markup is one & lt; template & gt ;. & lt; / p & gt; & lt; button & gt; & gt; & gt; button & gt; "" "; Var span = t.content.query selector ('span'); Span.text = "hello" + span.text; Var BTN = T content. Query selector ('button'); Btn..onClick.listen ((E) => Print ('Hello')); Shadow.nodes.add (t.content.clone (true)); } Code   
 displays the code statement and buttons, but the following did not work: 1. Styling, anything was not styled, I checked with the developer tool and this output "Disclaimed" found element ", 2. Click on the button  
 Any thoughts?   
 
 
 I found that it is not possible to hear items in templates unless the template is cloned and called and the listener S can be added to the script which is calling the template, it is applicable for both darts and js. To add event listeners to template items, we have to go one step above, and instead use custom elements

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