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Editorial Team
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Asked: 2026-05-23T02:46:41+00:00

In [1]: from lxml import etree I’ve got an HTML document: In [2]: root

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In [1]: from lxml import etree

I’ve got an HTML document:

In [2]: root = etree.fromstring(u'''<!DOCTYPE HTML PUBLIC "-//IETF//DTD HTML//EN">\n<HTML></HTML>''', etree.HTMLParser())

Its doctype is parsed correctly:

In [3]: root.getroottree().docinfo.doctype
Out[3]: u'<!DOCTYPE html PUBLIC "-//IETF//DTD HTML//EN">'

But when serializing it, I am losing it:

In [4]: etree.tostring(root.getroottree(), method='html')
Out[4]: '<html></html>'

What should I do to get that doctype serialized?

Debian GNU/Linux, Sid. Python 2.6.6. lxml 2.2.8-2.

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1 Answer

  1. Editorial Team

    Bug, as mentioned in a comment to another answer: missing doctype when serialized. Fix in February 2015 to be released in version 3.5 of lxml.

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