How to get HTML from collapsible-section-header?

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How to get HTML from collapsible-section-header?
I have this URL:
https://www.theice.com/clear-europe/risk-management#margins-europe
There is collapsible-section-header tag
and if I do like this:
string sMainURL = "https://www.theice.com/clear-europe/risk-management#margins-europe";
HtmlWeb hw = new HtmlWeb();
HtmlDocument doc = hw.Load(sMainURL);
I don't see las tag which contain a table.
How can I get whole HTML even if some headers are collapsible ?

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