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Bruce Lawson:
"Go .. try to find that missing closing tag on the div in your 100s of lines of HTML". https://medium.com/the-javascript-collection/html-wasnt-made-for-apps-59f870dfc075 Here: http://validator.w3.org/
@brucel another handy trick is to view source in Firefox. Malformed HTML is red and bold, easy to see.