HTML Validation

The “itemprop” attribute was specified, but the element is not a property of any item.

About This HTML Issue

An itemprop attribute has been found in the document, but it cannot be associated to any item. Most probable cause is the lack of an itemscope attribute defining an item.

Microdata allows nested groups of properties, which must be scoped to the item they belong to, as in this example:

<div itemscope>
   <p>My name is <span itemprop="name">Liza</span> and I'm <span itemprop="age">48</span> years old.</p>
</div>

Learn more:

→ Learn more about microdata

Last reviewed: October 27, 2022

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Related W3C Validator Issues (6)

Element “meta” is missing one or more of the following attributes: “itemprop”, “property”.

A <meta> element without a itemprop or property attributes has been found in an unexpected place.

While the <meta> element is commonly used within the <head> section of the document, it can also be used within the <body> section, for example in the context of defining microdata, as in this example:

<div itemprop="offers" itemscope itemtype="http://schema.org/Offer">
  Price: $<span itemprop="price">1.00</span>
  <meta itemprop="priceCurrency" content="USD" />
</div>

When used within the <body> section, the <meta> element is required to have a itemprop or property, and a content attribute, and it can’t have a http-equiv or charset attribute.

A common cause for this issue is including a <meta> element that was intended for the <head> section (for example one containing a http-equiv attribute in the <body> , for example:

<meta http-equiv="content-type" content="text/html; charset=UTF-8">
<form>
  ...
</form>

Bad value (true|false) for attribute “itemscope” on element “html”.

The itemscope attribute is a boolean attribute in HTML5, which means it does not take any values. Adding any value (such as true or false) will cause an error. When using boolean attributes, they should either be present or absent. If an attribute like itemscope is present, it is considered true.

Here’s how to correct the error:

Incorrect Usage:

<div itemscope="true">

Correct Usage:

<div itemscope>

Explanation:

Simply including the itemscope attribute without any value is the correct way to use it.
If you don’t want to use the itemscope attribute, just remove it from the tag.

Element “link” is missing one or more of the following attributes: “itemprop”, “property”, “rel”.

link elements are used to link to external resources, such as stylesheets, scripts, and icons. Including relevant attributes in the link element helps provide additional information about the linked resource.

rel: The rel attribute specifies the relationship between the current document and the linked resource, and can also provide additional information about the type of linked resource. For example, using rel="stylesheet" for a linked CSS file or rel="icon" for a linked favicon.
itemprop: If the linked resource is an HTML document or a microdata vocabulary like Schema.org, use itemprop to specify properties the linked document or vocabulary defines.
property: If the linked resource is an RDF resource, use property to provide metadata about the relationship between the current document and the resource being linked.

Example with rel attribute:

<head>
  <link rel="stylesheet" href="styles.css">
<!-- Other meta tags -->

</head>

Example with itemprop and property attributes:

<head>
  <link itemprop="mentions" href="https://example.com/"> 
  <link property="schema:citation" href="https://example.com/article.html">
<!-- Other meta tags -->

</head>

By adding itemprop, property, or rel as necessary, you can ensure your link elements provide appropriate context and semantic meaning to your HTML document.

Element “meta” is missing one or more of the following attributes: “charset”, “content”, “http-equiv”, “itemprop”, “name”, “property”.

There’s an incomplete or incorrectly formed <meta> tag. The <meta> tag in HTML is used to provide metadata about the HTML document. This metadata is typically specified using attributes like charset, content, http-equiv, itemprop, name, and property.

To fix this issue, you need to ensure that your <meta> tags include at least one of these attributes. Here are some examples of properly formed <meta> tags with each of these attributes:

Using the charset attribute:
```
<meta charset="UTF-8">
```
This specifies the character encoding for the HTML document, which is crucial for displaying text correctly in different languages.
Using the content and name attributes:
```
<meta name="description" content="A brief description of the webpage content.">
```
This provides a description of the webpage content, which can be used by search engines.
Using the http-equiv and content attributes:
```
<meta http-equiv="refresh" content="30">
```
This specifies information to be passed to the browser, such as refreshing the page every 30 seconds.
Using the property and content attributes:
```
<meta property="og:title" content="Your Webpage Title">
```
This is used for Open Graph meta tags, which improve the appearance of shared content on social media platforms.

Correct Usage Example

Here’s an example of an HTML document with a properly formed set of <meta> tags:

<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <meta name="description" content="A brief description of the webpage content.">
    <meta http-equiv="refresh" content="30">
    <meta property="og:title" content="Your Webpage Title">
    <title>Document</title>
</head>
<body>
<!-- Page content goes here -->

</body>
</html>

Element “meta” is missing one or more of the following attributes: “content”, “itemprop”, “property”.

The “itemtype” attribute must not be specified on elements that do not have an “itemscope” attribute specified.

When the itemtype attribute is specified on an HTML element, the boolean attribute itemscope must also be present in that element.

Here’s an example of how to use the itemscope attribute with the itemtype attribute:

<div itemscope itemtype="http://schema.org/Person">
  <p><span itemprop="name">Liza Jane</span></p>
  <p><span itemprop="email">liza.jane@example.com</span></p>
</div>

In this example, the itemscope attribute is used to indicate that the div element is a microdata item, and the itemtype attribute is used to specify that the type of this item is http://schema.org/Person.

If you don’t need to specify a type for the data represented by the HTML element, you can simply remove the itemtype attribute. For example:

<div itemscope>
  <p><span itemprop="name">John Doe</span></p>
  <p><span itemprop="email">john.doe@example.com</span></p>
</div>

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