Collapsed lines in Sage cells

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When I put Sage cells on a website, there are, next to some of the line numbers, those small triangles, which, when clicked upon, make part of the code collapse (or re-appear, after clicking again). Is there any way in which I, as the website programmer, can make sure that certain triangles are activated after loading the page so that the corresponding code section is collapsed once the page is loaded?

Thank you!