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Contents added to html

Hi,
I’ve started do modify templates (Web Context) from an other developer and after my coding I get html output with tags/classes which are not mine:

  • <mark style="display: none;"></mark>
  • <… class="ol_selected" …>
  • <… class="ol_hascaret" …>

Am I doing sth. wrong?
(Designer 2019.2)