Implement 'xmlattr' filter according to the jinja2 specification:
Create an SGML/XML attribute string based on the items in a dict. All values that are neither none nor undefined are automatically escaped:
<ul{{ {'class': 'my_list', 'missing': none,
'id': 'list-%d'|format(variable)}|xmlattr }}>
...
</ul>
Results in something like this:
<ul class="my_list" id="list-42">
...
</ul>
As you can see it automatically prepends a space in front of the item if the filter returned something unless the second parameter is false.
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HTML:
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