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An extension to Python Markdown which implements legacy attributes.
Prior to Python-Markdown version 3.0, the Markdown class had an `enable_attributes`
keyword which was on by default and provided for attributes to be defined for elements
using the format `{@key=value}`. This extension is provided as a replacement for
backward compatibility. New documents should be authored using `attr_lists`. However,
numerous documents exist which have been using the old attribute format for many
years. This extension can be used to continue to render those documents correctly.
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