HTML Guide

An </a> end tag has been found to violate nesting rules. <a> tags can’t include other <a> tags inside. Most probable cause is an unclosed <a> tag, like in this example:

<a href="one.html">Page 1
<a href="two.html">Page 2</a>

An <a> tag can’t include other <a> tags inside. Most probable cause is an unclosed <a> tag, like in this example:

<a href="one.html">Page 1
<a href="two.html">Page 2</a>

The <iframe> HTML element represents a nested browsing context, embedding another HTML page into the current one.

As the iframe is a container that holds an embedded HTML page, it cannot be nested inside an a tag.

An <input> tag can’t be used inside an <a> tag.

A <label> tag can’t be used inside an <a> tag. Consider using other tags like <span>.

A button element, or an element with the role=button attribute, is not allowed to be nested inside an <a> element.

An <a> element cannot contain a descendant element with the attribute tabindex.

The <textarea> element does not have a type attribute.

The HTML <textarea> element represents a multi-line plain-text editing control, and is useful when you want to allow users to enter a sizeable amount of free-form text, for example a comment on a review or feedback form.

The href attribute of an <a> element contains an invalid character, that should be properly encoded as a URI percent-encoded character.

The attribute rows on a textarea element, when present, must be a positive integer.

The <textarea> HTML element represents a multi-line plain-text editing control, useful when you want to allow users to enter a sizeable amount of free-form text, for example a comment on a review or feedback form. Its attributes rows and cols allow to define the dimensions of the text area by respectively specifying the numbers of rows and columns.

Example:

<textarea name="comments" rows="5" cols="25">
  It all works great!
</textarea>