[wip] use html_text to get element text content in microdata #114
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This is an unfinished fix for #113, please don't merge. I've opened the PR just to share initial code. It has these problems:
<style>
elements are removed. This may cause missing extractions, if microdata is set on these elements.The problem with not cleaning HTML tree once is that it could make algorithm O(N^2) - but maybe that's fine.