CoCalc provides the best real-time collaborative environment for Jupyter Notebooks, LaTeX documents, and SageMath, scalable from individual users to large groups and classes!

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class Anemone::Extractors::Frames < Anemone::Extractors::Base
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  def run
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    doc.css( 'frame', 'iframe' ).map { |a| a.attributes['src'].content rescue next }
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  end
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end
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