Lists are the backbone of organized information. Whether you're building a navigation menu or a step-by-step guide, HTML lists provide the essential structure for group data.
1Sequence vs. Set
The choice between <ul> and <ol> is a semantic choice. An Unordered List represents a set where sequence is irrelevant. An Ordered List represents a sequence where rank is vital. Choosing correctly helps screen readers understand the data.
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2The Mandatory Child
The most important rule is the LI Mandate. A list container is only allowed to contain <li> (List Item) tags as its direct children. To nest lists safely, place the new <ul> or <ol> entirely inside an existing <li> tag.
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