Special HTML characters (<>&"') inside the main text or PDF metadata (e.g.: title) are not escaped in the HTML output, possibly resulting in invalid HTML. This is trivial to reproduce, but, if you need a sample doc, just ask...
Having the file to reproduce will make it easier to fix, so yes, attach such a file.
Created attachment 105255 [details] Pdf document with a title property, and a text body, containing HTML special characters The HTML special characters, should be replaced with character entities in the HTML output (< should become < etc.) but they are not. As a result, some pieces of text disappear in the display (e.g. <un tag>), or bad HTML syntax results in unpredictable behaviour.
Forgot: if someone is looking at this, the problem is also present for the "content" attribute of <meta> elements. Generally, no text should go from the PDF to the HTML document without being escaped.
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