gh-81623: Do not add whitespace to significant content when pretty-printing - #156660
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serhiy-storchaka merged 4 commits intoSep 13, 2026
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… space XML defines white space as " \t\r\n" (see XML 1.0, 2.3), but str.strip() also strips other characters, such as U+00A0. Such characters could be lost in ElementTree.indent(), in canonicalize(strip_text=True), and when parsing with the whitespace-in-element-content feature turned off.
…ttyxml() Whitespace is no longer added inside an element which is marked with xml:space="preserve", which is declared in the DTD as not having element content, or, in absence of such declaration, which contains text. Previously such indentation changed the content of the element.
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ElementTree.indent() only avoided overwriting text and tails which are not white space, but in an element which contains text the white space between them is significant too. xml:space="preserve" is now honored as well.
serhiy-storchaka
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…ty-mixed-content # Conflicts: # Lib/test/test_xml_etree.py # Lib/xml/etree/ElementTree.py
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Based on #156659.
Pretty-printing added whitespace inside an element which contains text, which changed its content.
xml.dom.minidom.Node.toprettyxml()indented every child of an element:>>> parseString("<p>hello <b>world</b>!</p>").documentElement.toprettyxml() '<p>\n\thello \n\t<b>world</b>\n\t!\n</p>\n'xml.etree.ElementTree.indent()only avoided overwriting text and tails which are not white space, but the white space between them is significant too:Now whitespace is not added inside an element which is marked with
xml:space="preserve"or which contains text.toprettyxml()also takes into account the content model declared in the DTD (only white space in element content is ignorable, see XML 1.0, 3.2.1), which covers the case in the issue.This extends gh-48397, which exempted only an element whose single child is a text node.