Default theme implementation for a node edit form.
Two column template for the node add/edit form.
This template will be used when a node edit form specifies 'node_edit_form' as its #theme callback. Otherwise, by default, node add/edit forms will be themed by form.html.twig.
Available variables:
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Licensed under the GNU General Public License, version 2 and later.
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https://api.drupal.org/api/drupal/core!modules!node!templates!node-edit-form.html.twig/8.1.x