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Editorial Team
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Asked: 2026-05-18T01:03:51+00:00

There are many people that mark closing tags like this to help identify the

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There are many people that mark closing tags like this to help identify the closing tag that goes with an HTML tag:

<div id="header">
  <div id="logo">
    <a href="index.php">
      <img id="logoimg" src="images/as_logo.png" alt="Logo" border="0" />
    </a>
  </div> <!-- logo -->
</div> <!-- header -->

I was wondering if it is syntactically ok to do this:

<div id="header">
  <div id="logo">
    <a href="index.php">
      <img id="logoimg" src="images/as_logo.png" alt="Logo" border="0" />
    </a>
  </div id="logo">
</div id="header">

UPDATE: Here is the text from the spec on HTML5.3:

8.1.2.2. End tags
End tags must have the following format:

  1. The first character of an end tag must be a U+003C LESS-THAN SIGN
    character (<).
  2. The second character of an end tag must be a U+002F
    SOLIDUS character (/).
  3. The next few characters of an end tag must be
    the element’s tag name.
  4. After the tag name, there may be one or more
    space characters.
  5. Finally, end tags must be closed by a U+003E
    GREATER-THAN SIGN character (>).

8.1.2.3. Attributes
Attributes for an element are expressed inside the element’s start tag.

Note that attributes are only allowed on START TAGS.

using @jbyrds idea; using the HR tag allows you to see if you forgot the z attribute:

<div id="header">
  <div id="logo">
    <a href="index.php" id=link">
      <img id="logoimg" src="images/as_logo.png" alt="Logo" border="0" />
    </a><hr z="link">
  </div><hr z="logo">
</div><hr z="header">

Although this adds more text, 32 extra characters vs. the original or the tags having a hidden class, you can use CSS to hide them.

[z] {
    display: none;
}
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1 Answer

  1. Editorial Team

    The answer is no for most tags. However, you could argue that tags like “img” that can be self-closing, are able to have attributes in them. But these self-closing tags are taking the place of an opening tag and a closing tag, so it’s not the same as having an attribute in a closing tag. To be honest, there is really no need for this, it would just create more for the browser to have to read and make the page size bigger.

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