%%form_raw{htmlopen}%%

<script type="text/javascript">
window.twttr = (function (d, s, id) {
var t, js, fjs = d.getElementsByTagName(s)[0];
if (d.getElementById(id)) return;
js = d.createElement(s); js.id = id; js.src= "https://platform.twitter.com/widgets.js";
fjs.parentNode.insertBefore(js, fjs);
return window.twttr || (t = { _e: [], ready: function (f) { t._e.push(f) } });
}(document, "script", "twitter-wjs"));
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<a class="twitter-timeline"
width="240"
height="200"
data-chrome="nofooter transparent"
href="https://twitter.com/twitterdev"
data-widget-id="%%form_raw{html}%%">
Tweets by @Tate
</a>

%%form_raw{htmlclose}%%

====
[[form]]
fields:
  htmlopen:
  type: hidden
  value: "[[html]]"
  htmlclose:
    type: hidden
    value: "[[/html]]"
  html:
    type: text
    label: HTML here
[[/form]]