W3C Markup Validator Ampersand (&) Error

w3c markup validator ampersand (&) error

for each & sign you got write &
in your example it would be:

c91588793296e2?s=50&d=http%3A%2F%

Replaced & with & W3C validator Still Showing Error

In all of those validation errors (from number 6 to 49), the ampersand is not necessary because you are passing a unique parameter.

<a href='//www.urgentfiles.com/search/label/Action?max-results=6'>
    Action
</a>

In cases with a URL containing two or more parameters, you need a double escape like & to correct the issue. For example.

<a href='//www.urgentfiles.com/search/label/Action?max-results=6&amp;other-param=demo'>
    Action
</a>

w3c Validation error message - Facebook widget

I had a quick look at:
http://validator.w3.org/docs/errors.html

25: general entity X not defined and no default entity

This is usually a cascading error caused by a an undefined entity reference or use of an unencoded ampersand (&) in an URL or body text.

325: reference to entity X for which no system identifier could be generated

This is usually a cascading error caused by a an undefined entity reference or use of an unencoded ampersand (&) in an URL or body text.

Perhaps try replacing those ampersands with & and see how you get on?

Edit for facebook question: think you need a doctype that supports data-href etc. See:
W3C validation error with data-href

How to write url's in achor links so doesn't fire errors/warings @ w3c validator

The equal sign throws no errors. Replace the & with & like so:

<a href="http://domainame.com/?bla=ble&bli=blo">hey!</a>

How can I include an ampersand (&) character in an XML document?

Use a character reference to represent it: &

See the specification:

The ampersand character (&) and the left angle bracket (<) MUST NOT appear in their literal form, except when used as markup delimiters, or within a comment, a processing instruction, or a CDATA section.

If they are needed elsewhere, they MUST be escaped using either numeric character references or the strings "
&
" and "
<
" respectively. The right angle bracket (>) may be represented using the string "
>
", and MUST, for compatibility, be escaped using either "
>
" or a character reference when it appears in the string "
]]>
" in content, when that string is not marking the end of a CDATA section.

What is & used for

& is HTML for "Start of a character reference".

& is the character reference for "An ampersand".

¤t; is not a standard character reference and so is an error (browsers may try to perform error recovery but you should not depend on this).

If you used a character reference for a real character (e.g. ™) then it (™) would appear in the URL instead of the string you wanted.

(Note that depending on the version of HTML you use, you may have to end a character reference with a ;, which is why &trade= will be treated as ™. HTML 4 allows it to be ommited if the next character is a non-word character (such as =) but some browsers (Hello Internet Explorer) have issues with this).

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