On Package Details page, <ul role="tree" aria-label="Outline">…</ul> suggests that all headers within <div class="js-docContent"> are structurally equal. Right now, most headers are <h3> and so are marked as subsections of Overview <h2 tabindex="-1" id="pkg-overview" class="Documentation-overviewHeader">…</h2>. If these are not subsections of overview, they should also be <h2>. Additionally, the <ul role="tree" aria-label="Outline">…</ul> suggests that there is a logical grouping for Functions and Types which is not reflected as headers. Functions and Types should be added as header, <h2> if equal to Overview, or <h3> if subsections of Overview. Individual Functions and Types in the package should be grouped as subsections of the new headers, with either <h3> or <h4> tags depending on the heading level of their parent section. For consistency with the UL, my recommendation is for Overview, Examples, Constants, Variables, Functions and Types to be <h2> and individual functions and types to be marked as <h3> subsections of their parent headers.