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function show(lang){ /* hide / show the policy blocks */ blocks.forEach(b => b.hidden = (b.dataset.lang !== lang)); /* highlight the active button */ buttons.forEach(a => a.classList.toggle('active', a.dataset.lang === lang)); } /* click-handlers */ buttons.forEach(a => a.addEventListener('click', e => { e.preventDefault(); show(a.dataset.lang); })); /* default language */ show('en'); });