ruby - How to get width of an element with xpath Watir in pixels? -

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I have a problem getting the width of the "tobis" element with xpath watir. I have this code: 

  browser.element (: xpath, "// table [@ onselectstart = 'return false']"). Tbody.tr (: Index, 2) .td. This code gives me "auto", which is fine because this attribute should be set to "auto" so that it is automatically located on the web, but if I look at the firebug, I show the width of the element like i Can I get this value in pixels?   
 
 
 Try to do something (not tested):   Browser.Limit ((xpath, "// table [@ onselectstart = 'return false']). Tbody.tr (: index, 2) .td.table.tbody.wd.size width   
 See the documentation for more information, and.

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