HTML Guide for fragment
An <a> element has been found with an invalid href attribute, containing more than one # adjacent character.
The # is used to separate the fragment part of an URI (typically used to indicate a section within a document). For example, this is a valid link to a URI containing a fragment:
<a href="https://example.com/faqs#pricing">pricing</a>The next example is invalid because it contains two adjacent # characters, so that the fragment part would be #pricing instead of pricing:
<a href="https://example.com/faqs##pricing">pricing</a>A fragment identifier (the part after #) is not allowed in a data: URL used in an img src.
The img element accepts any valid URL in the src attribute, including data URLs per RFC 2397. However, RFC 2397 forbids fragment identifiers in data: URIs.
If you need to reference an internal fragment (e.g., an SVG symbol or id), use one of these approaches:
- Inline the SVG in the DOM and reference its ids normally.
- Put the SVG in a separate file and use a standard URL with a fragment (example.svg#icon).
- Remove the fragment from the data: URL and ensure the content renders without fragment navigation.
Curly braces {} are not allowed in the href attribute value of an <a> element because they are not permitted in valid URLs.
According to the HTML standard and URL specification, certain characters—including { and }—must be percent-encoded in URLs to avoid validation errors and ensure proper browser handling. If you need to include a curly brace in a URL, use percent-encoding: { is %7B and } is %7D.
Incorrect HTML:
<a href="http://example.com/?i=470722{0}">Link</a>Correct HTML with percent-encoding:
<a href="http://example.com/?i=470722%7B0%7D">Link</a>Resulting link:
http://example.com/?i=470722%7B0%7D
Only use plain { or } if you are generating URLs client-side (for example, as template placeholders in JavaScript). To validate properly, always encode or remove illegal characters in attribute values.
The href attribute in the a tag uses an invalid character, as > is not allowed in URL fragments.
According to the HTML standard and URL syntax, fragment identifiers (the part after #) can only contain certain characters. The > character is not permitted and must be removed or percent-encoded. If the > is unintentional, simply omit it; if it must be included as part of the fragment, encode it as %3E.
Original HTML (invalid):
<a href="/page.php>">Read more</a>Corrected HTML (if > should not be present):
<a href="/page.php">Read more</a>Corrected HTML (if > is required in fragment, encode it):
<a href="/page.php%3E">Read more</a>