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It helps in organizing a page and applying CSS to have an element that can be used for dividing the source code in the page. The issue with HTML 5.1 is that what elements are included within such a di…
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I got a [user request today for CSP-checking feature in the the W3C HTML Checker to add support for the `require-sri-for` directive](https://github.com/validator/validator/issues/382) but the latest (…
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**Reported by aaron on 12 Nov 2013 16:29 UTC**
The SVG spec at http://www.w3.org/TR/SVG/filters.html#feCompositeIn2Attribute says that in2 on feComposite operates like in, and every SVG implementation…
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There are a lot of errors being thrown on Google Map links for files run against Nu HTML Checker.
The error is: "Bad value https://www.google.com/maps/place/22°34'N 59°32'E/data=!4m2!3m1!1s0x0:0x0 fo…
ghost updated
8 years ago
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Consider the following document:
``` html
Test
Title
Subtitle
```
[In the **Heading-level outline** output from the checker for that doc](https://validator.w3.org/nu/?showoutline=yes&doc=data%3At…
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Today my 30 students in class validated the same html document and were not able to recheck because it stated we were "abusing our IP address". I have never had an error like this in class and have us…
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Hello,
can you please check the line and tell why the validator reports the fatal error for it:
``
https://validator.w3.org/nu/?showsource=yes&doc=http%3A%2F%2Fpergola.kz%2F
Thanks a lot in advanc…
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As many people have been lead to believe it actually effects the semantics of headings, when in practice it does not, currently HTML has a [warning for web developers](https://www.w3.org/TR/html5/sect…
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Nu Html Checker includes the links to attribute definitions in the error messages.
For example,
https://validator.w3.org/nu/?doc=data%3Atext%2Fhtml%2C%3C!doctype+html%3E%3Chtml+dummy%3E
>
> Attribu…
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"[The Nu Html Checker (v.Nu)](http://validator.github.io/validator/)" web page offers clear instructions on running the checker as a standalone service. Thank you!
However, you have to dig into the c…