The term for the text between the opening and the closing tag?

In <span>foo</span> what's the proper term to refer to f开发者_开发问答oo?

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From the W3C XML Specification:

Definition: The text between the start-tag and end-tag is called the element's content

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The content of the text child node of the <span> element.

See quirksmode on this:

So if you do

<P>This is a paragraph</P>

you have created two nodes: an element P and a text node with content 'This is a paragraph'. The text node is inside the element, so it is considered a child node of the element.

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Personally I call it content or text

The content in the span is foo

This sounds correct IMO.

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Quoting from w3schools

An XML element is everything from (including) the element's start tag to 
(including) the element's end tag.    
An element can contain other elements, simple text or a mixture of both.
Elements can also have attributes.

<bookstore>
  <book category="CHILDREN">
    <title>Harry Potter</title>
    <author>J K. Rowling</author>
    <year>2005</year>
    <price>29.99</price>
  </book>
  <book category="WEB">
    <title>Learning XML</title>
    <author>Erik T. Ray</author>
    <year>2003</year>
    <price>39.95</price>
  </book>
</bookstore> 

In the example above, <bookstore> and <book> have element 
contents, because they contain other elements. <author> has 
text content because it contains text.

So, "text content"

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I'd refer to it either as "content" or "text".

Given HTML as a markup language, you could also refer to it as "the described".

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Depends on context, to me.

In Javascript it would be the innerHTML property.

In HTML it is simply content:

• <span> is the start tag
• foo is content
• </span> is the end tag