<html><head><style>/* 默认的 CSS 值 */q { display: inline;}q:before { content: open-quote;}q:after { content: close-quote;}q.customized:before { content: "- ";}</style></head><body><p>默认情况下，q 元素会这样显示：</p><q>Build a future where people live in harmony with nature.</q><p>自定义的 q 元素（更改 content）：</p><q class="customized">Build a future where people live in harmony with nature.</q></body></html>