how to get elements in webvie of metro

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C#

Javascript

Metro-design

hi
I like to get all html elements in array from metro webview
I can get it as string with this code

ttt.Text = w1.InvokeScript("eval", new string[] { "document.documentElement.outerHTML;" });

but want them as array, to search its tagname and innerhtml
even webview doesn't support document.getelementbytagname
or any .contains() so I decided to find a way to get elements as array
but I couldn't find, can some one help me?