For security reasons, the HTML support for knowledge base entries is limited to a subset of HTML. When saving your HTML code, the system may remove HTML elements that include or specify JavaScript, certain iframes without a source, objects, and inline SVG.
Note that if an agent tries to reply from a channel that does not provide HTML support and that no text version is available for that entry, the existing HTML versions will be displayed for the agent to select and will be automatically converted into a raw text format when inserted. Images or links are also automatically adapted.