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New posts in w3c-validation
How to add non-standard attributes in a valid way
Sep 15, 2025
javascript
html
validation
w3c-validation
Attribute data-ls not allowed on element svg at this point. how to rectify it
Sep 13, 2025
html
svg
w3c
w3c-validation
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W3C Validation Failed, Illegal character in path segment: space is not allowed
Sep 08, 2025
html
css
w3c-validation
Is it acceptable for a submit button to have a name attribute?
Mar 26, 2023
html
coding-style
standards
w3c-validation
Why won't <iframe> elements validate in HTML 4.01?
Feb 27, 2023
html
iframe
w3c-validation
html4
@media queries : getting an error in W3C CSS Validation Service
Jan 20, 2023
css
xhtml
media
w3c-validation
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W3C validator complaining about duplicate div
Dec 12, 2022
html
w3c-validation
HTML Tables: Semantics of empty cells
Dec 11, 2022
html
html-table
semantic-markup
w3c-validation
Ampersands in hyperlinks cause W3C validation to fail
Dec 02, 2022
html
validation
web-standards
w3c-validation
Does w3c standards allow for same z-indexes
Dec 02, 2022
html
css
z-index
w3c
w3c-validation
Why would you need a "Valid XHTML & CSS" notice at the end of a page
Nov 29, 2022
html
css
user-interface
standards-compliance
w3c-validation
SVG and CSS properties in the same file
Nov 14, 2022
css
svg
w3c-validation
Remove frameborder attribute on the iframe of Recaptcha
Nov 02, 2022
javascript
html
iframe
recaptcha
w3c-validation
W3C validator error: Attribute placeholder is only allowed when the input type is
Nov 02, 2022
html
placeholder
w3c-validation
html-input
Bad value pagination for attribute role on element nav
Dec 08, 2020
html
w3c
w3c-validation
wai-aria
W3C error validating - Bad value for attribute href on element a: Illegal character in query: not a URL code point
Oct 14, 2021
html
w3c-validation
W3C Validation: Attribute alt not allowed on element a at this point
May 15, 2019
html
w3c-validation
How can I validate CSS on internal web pages?
Dec 01, 2020
css
linux
validation
java
w3c-validation
HTML5 Validation error with select required attribute
Oct 04, 2022
html-select
w3c-validation
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