An accordion can shorten a page without removing information. It can also hide the one detail a visitor needs to decide whether to continue. Start with the content decision before choosing the animation.
Leave the essential answer visible
If every visitor needs a price condition, eligibility rule or deadline, burying it inside a collapsed section creates unnecessary work. Use expandable areas for supporting detail whose relevance varies between readers. The page should still communicate its main purpose before any section is opened.
Write labels that describe the content, such as “Delivery areas and exclusions,” rather than “More information.” A visitor should be able to predict what opening the section will reveal.
Build a control, not a clickable heading imitation
The W3C accordion pattern describes button controls, expanded state and keyboard behaviour. Use appropriate semantics and communicate whether a panel is open. Styling a paragraph to resemble a button does not provide the same interaction.
Test the component with a keyboard. Focus should be visible, controls should operate as expected and opening a panel should not unexpectedly send the user elsewhere on the page. Check the relationship between headings and panels with assistive technology as part of the implementation review.
On a phone, inspect long labels and expanded text. Make sure the touch target remains usable and the content does not overflow. Consider what happens when a visitor arrives through a link to material inside a closed panel.
A practical content test is to ask someone to find one important answer without telling them which panel contains it. If they repeatedly open unrelated sections, improve the labels or move the answer into the visible page.
Do not add an accordion merely because the page looks long in a design mockup. Sometimes concise headings and ordinary text are easier to scan. The component should reduce the effort of finding relevant detail, not just reduce the height of the screenshot.