Does jQuery internally convert HTML5 data attribute keys to lowercase?

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If you use 

data-action-method="delete"

then you can access the attribute with

$('.action').data('actionMethod')

This is part of the HTML5 DOM API:

The custom data attributes is transformed to a key for the
DOMStringMap entry with the following rules:

  • any dash (U+002D) is removed;
  • any letter following a dash (U+002D), before its removal, is set in its uppercase counterpart.

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