Connected: An Internet Encyclopedia
3.2.4. Attributes

Up: Connected: An Internet Encyclopedia
Up: Requests For Comments
Up: RFC 1866
Up: 3. HTML as an Application of SGML
Up: 3.2. HTML Lexical Syntax
Prev: 3.2.3. Names
Next: 3.2.5. Comments

3.2.4. Attributes

3.2.4. Attributes

In a start-tag, white space and attributes are allowed between the element name and the closing delimiter. An attribute specification typically consists of an attribute name, an equal sign, and a value, though some attribute specifications may be just a name token. White space is allowed around the equal sign.

The value of the attribute may be either:

In this example, <img> is the element name, src is the attribute name, and `http://host/dir/file.gif' is the attribute value:

   <img src='http://host/dir/file.gif'>

A useful technique for computing an attribute value literal for a given string is to replace each quote and white space character by an entity reference or numeric character reference as follows:

                     ENTITY      NUMERIC
           --------- ----------  -----------  ---------------------
             HT                  &#9;         Tab
             LF                  &#10;        Line Feed
             CR                  &#13;        Carriage Return
             SP                  &#32;        Space
             "       &quot;      &#34;        Quotation mark
             &       &amp;       &#38;        Ampersand

For example:

   <IMG SRC="image.jpg" alt="First &quot;real&quot; example">

The `NAMELEN' parameter in the SGML declaration (9.5, "SGML Declaration for HTML") limits the length of an attribute value to 1024 characters.

Attributes such as ISMAP and COMPACT may be written using a minimized syntax (see "Omitted Attribute Name" in [SGML]). The markup:

   <UL COMPACT="compact">

can be written using a minimized syntax:


Next: 3.2.5. Comments

Connected: An Internet Encyclopedia
3.2.4. Attributes