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<div{{ attributes.addClass('my-class') }}>
<div{{ attributes.removeClass('my-class') }}>
<div{{ attributes.setAttribute('id', 'myID') }}>
<div{{ attributes.removeAttribute('id') }}>

{% if attribute.hasClass('myClass') %}
  {# do stuff #}
{% endif %}

{# printing out individual attributes #}
{# and use "without" filter to prevent attributes that have already been printed #}
<div class="{{ attributes.class }} my-custom-class"{{ attributes|without('class') }}>