class ActionView::Helpers::FormBuilder

element's submit button, regardless of where it exists in the DOM.
element should be treated as the

form HTML attribute, we hint to the browser that the generated
exist outside of the element. By declaring the
In the example above, the :sticky_footer content area will

<% end %>
<% end %>
<%= form.button(form: f.id) %>
<% content_for :sticky_footer do %>

<%# ... %>
<%= form_for @post do |f| %>

return the element's id attribute.

Generate an HTML id attribute value.

def id
  options.dig(:html, :id) || options[:id]
end