Code Changes in HTML Widget

Hi when i enter in the html widget:

<a class="twitter-timeline" href="">Tweets by sitio_web_quito</a> <script async src="" charset="utf-8"></script>

BlocsApp changes the code to:

<iframe id="twitter-widget-0" scrolling="no" frameborder="0" allowtransparency="true" allowfullscreen="true" class="twitter-timeline twitter-timeline-rendered" data-widget-id="profile:sitio_web_quito" title="Twitter Timeline" style="position: static; visibility: visible; display: inline-block; width: 100%; padding: 0px; border: none; max-width: 100%; min-width: 180px; margin-top: 0px; margin-bottom: 0px; min-height: 200px; height: 14752.5px;"></iframe> <script async="" src="" charset="utf-8"></script>

and then it doens’t output the twitter timeline.

How can i have blocs to not change the original code?