问题
Is the proper HTML entity for giving dimensions ×? I want to be semantically correct, but that begs the question, is listing a dimension as 2" x 3" even semantic? If the x represents "by", would I use the letter x or ×?
In my code I've been using 2″ × 3″, or 2″ × 3″. The non-breaking spaces are to prevent the dimension from being wrapped, as per the suggestions found in The Elements of Typographic Style Applied to the Web.
回答1:
×
- Unicode:
U+00D7 MULTIPLICATION SIGN - HTML:
×,× - CSS:
\00d7
See the Wikipedia article about the multiplication sign:
In mathematics, the symbol × (read as times or multiplied by) is primarily used to denote the […]
- Geometric dimension of an object, such as noting that a room is 10×12 feet in area.
Depending on the context, the math element (for MathML) element could be of use.
回答2:
The proper question is which character should be used. The use of entity references for characters adds no semantics. There is no formal standard on denoting dimensions, but clearly this is about multiplication rather than the Latin letter x, so “x” (×) is the correct character.
In practice, this is more of an orthography and typography question than about “semantic web”. Search engines, browsers, etc., don’t really care; it’s the human readers that matter.
回答3:
You're doing everything correctly. I believe × here is [semantically] related to the operation of multiplication, i.e. in fact you write the area by specifying two dimensions.
来源：https://stackoverflow.com/questions/12009545/what-is-the-proper-html-entity-for-the-x-in-a-dimension