Walter Davis wrote in post #956434:
> Rails 3 (last time I fooled with it, which was pre-release) shipped
> with a completely HTML5 scaffold system, encouraging you to write your
> own bits in HTML5 as well.

Yes, Item #6 below confirms my earlier thoughts about the optional 
self-closing tags.

Start tags must have the following format:

1. The first character of a start tag must be a U+003C LESS-THAN SIGN 
character (<).

2. The next few characters of a start tag must be the element's tag 
name.

3. If there are to be any attributes in the next step, there must first 
be one or more space characters.

4. Then, the start tag may have a number of attributes, the syntax for 
which is described below. Attributes may be separated from each other by 
one or more space characters.

5. After the attributes, or after the tag name if there are no 
attributes, there may be one or more space characters. (Some attributes 
are required to be followed by a space. See the attributes section 
below.)

6. Then, if the element is one of the void elements, or if the element 
is a foreign element, then there may be a single U+002F SOLIDUS 
character (/). This character has no effect on void elements, but on 
foreign elements it marks the start tag as self-closing.

7. Finally, start tags must be closed by a U+003E GREATER-THAN SIGN 
character (>).

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