How write an expression HTML on Page Editor ?

[Salvacal]

Hi, I have a little problem, I can't store an HTML expression at the Pages editor (see Screenshot)
The line is this: <div class="tiva-events-calendar full" data-source="php" data-start="monday"> </div>

I have tried in various ways but it saves only this: <div class = "tiva-events-calendar full"> </div>

I tried also inserting something inside the DIV to see if doesn't delete it:  <div class ="tiva-events-calendar full" data-source ="php" data-start="monday">TEST</div> but the result is the same.
Where am I wrong? Can someone help me? Thank you in advance.

[Prescol]

Go to preferences-> general and disable "use html purifier"

[Salvacal]

12 minutes ago, Prescol said:

Go to preferences-> general and disable "use html purifier"

Great ! Thanks a lot...