Can't add class attributes to Link element when onclick is NOT set to default behaviour

EDIT: Can't actually add anything to "Extra attributes" with the settings described below. For example adding

style:margin-top:33px

renders as
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<a style="margin-top:29px;class:G2-dynamic"

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Trying to figure out how to get onclick: load new content or remove closest matching element to work for "link" form elements. Styling my buttons with

class:icon labeled

in the "Advanced->Extra attributes" setting.
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The link is rendered as:

<a class="ui button labeled iconclass:G2-static blue"