A CSS Hover-Reveal Pattern for Technical Specs

The problem on the Gate Seal page The Gate Seal product page for a maritime client needed to present detailed specifications without turning the layout into a wall of text or a table that looked like an export from Excel. The technical detail buyers cared about was present, but visually buried. The requirement was to surface those details in a compact way, keep the implementation CSS-only, and make sure it still worked with keyboard navigation. The hover-reveal pattern The pattern below uses a hover-reveal on key specification rows. On desktop, moving the cursor over a spec row reveals additional context. With a keyboard, focusing the same row does the same thing. No JavaScript is required for the basic interaction. Structurally, each spec item is a container with two layers of content: Always-visible summary (label and primary value) Hidden detail that appears on hover or focus Here is a simplified version of the markup: <div class="spec-list"> <button class="spec-item"> <div class="spec-main"> <span class="spec-label">Gate size</span> <span class="spec-value">Up to 6 m</span> </div> <div class="spec-detail"> Custom diameters available for retrofit situations. </div> </button> <button class="spec-item"> <div class="spec-main"> <span class="spec-label">Seal material</span> <span class="spec-value">EPDM / NBR</span> </div> <div class="spec-detail"> Oil-resistant compounds for lock gates in heavy traffic.</div> </button> </div> The choice of <button> here is deliberate: it is naturally focusable, works with keyboard navigation, and is announced as an interactive element by assistive technology. In a production implementation, the button semantics can be adapted depending on whether you need a true button or a different element with role="button" . The CSS-only interaction The interaction is controlled through :hover and :focus-visible , with a basic transition for a smoother reveal. .spec-list { display: grid; gap: 0.75rem; } .spec-item { width: 100%; text-align: left