Incorrectly decoding encoded HTML tags

[apjones6]

With a standard MD parser encoded HTML tags allows you to include them as readable text. For example (plain HTML included for comparison):

<iframe src="http://www.w3schools.com"></iframe>
<iframe src="http://www.w3schools.com"></iframe>

results in the output HTML:

<p>&lt;iframe src="http://www.w3schools.com"&gt;&lt;/iframe&gt;</p>
<iframe src="http://www.w3schools.com"></iframe>

However if I put this output HTML through to-markdown the encoded < and > characters are erroneously decoded. This results in the following markdown:

<iframe src="http://www.w3schools.com"></iframe>
<iframe src="http://www.w3schools.com"></iframe>

(whitespace lines removed from examples for brevity)

[oliverguenther]

This is an actual issue for using turndown as a Markdown converter whenever using escaped HTML elements in the input format, as they will be incorrectly output as HTML tags. A quick hack to fix this is ensuring < and > are always re-encoded as entities.

[bjones1]

Duplicate issue: #261.