|Contained in||Inline elements, block-level elements|
The B element is a suitable choice for marking a structure for which no phrase element exists. For example, vectors in mathematics have no structural element in HTML 4.0, but bold text is often an appropriate visual rendering:
If two vectors <B CLASS=vector>v</B> and <B CLASS=vector>w</B> are orthogonal, we write <B CLASS=vector>v</B> ⊥ <B CLASS=vector>w</B>.
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