Input doesn't render in view

I use fat free framework and fuelux repeater. When I create an html element in controller files, I can't see the element in view. I realize what the problem it is, but I don't know the solution.

You have to print the raw HTML, since F3's template engine is automatically escaping it. Have a look at: https://fatfreeframework.com/3.6/views-and-templates#DataSanitation

Either use $f3->set('ESCAPE',FALSE); to disable escaping globally (not recommended) or add a filter in your template for the variable you want to keep unescaped like this: {{ @html_content | raw }}