HTML Guide
Free site validation
Find out what web pages on your sites are affected by HTML issues.
The text-anchor attribute is used within SVG elements like text or textPath to specify the alignment of text relative to a given point, but it’s not allowed on g container elements.
Here’s an example of how you can correctly use the text-anchor attribute on a <text> element in SVG:
<svg width="200" height="200">
<text x="100" y="100" text-anchor="middle">Centered text</text>
</svg>In this example:
-
The
text-anchor="middle"attribute is applied directly to the<text>element. - It aligns the text in the middle horizontally around the specified x-coordinate.
You can use the text-anchor element with the SVG elements text, textPath, tref or tspan.
The allowed values for the text-anchor attribute are start, middle or end. The value none is not valid for this attribute.
Learn more:
Related W3C validator issues
The attribute xmlns:serif is not valid. Check this guide for more information on this issue.
The attribute xmlns:serif is not a valid namespace. This attribute is set by Affinity Designer on SVG exports.
The only permitted value for the xmlns attribute is http://www.w3.org/2000/svg.
The namespace declaration for an <svg> element is provided by the xmlns attribute like this:
<svg xmlns="http://www.w3.org/2000/svg">
<!-- more tags here -->
</svg>Although using https in the URL looks like it’s going to be more secure, in fact this URL is not used to connect it to, only to declare the namespace.
The autocomplete attribute on an input, textarea, select or form element lets web developers specify how autocompleting should be handled.
The value none is not valid, instead the value off should be used to disable autocompletion.
Here is an example of how you can adjust your HTML code:
Incorrect usage:
<input type="text" name="username" autocomplete="none">Correct usage: If you want to disable autofill for an input field, you can use the value off instead of none:
<input type="text" name="username" autocomplete="off">The attribute value is either the keyword off or on, or a space-separated token list that describes the meaning of the autocompletion value, for example name, email, postal-code and others. Refer to the linked guide to see the full list of accepted values for the autcomplete property.
A <pattern> element has been found with an invalid ID. Check the format of the ID and ensure it does not start with a digit, full stop (.) or hyphen (-).
The <pattern> element is used within <svg> elements, which use XML 1.0 syntax. That syntax specifies that valid IDs only include designated characters (letters, digits, and a few punctuation marks), and do not start with a digit, a full stop (.) character, or a hyphen-minus (-) character.
The padding CSS shorthand property sets the padding area on all four sides of an element at once.
To specify no padding, use padding: 0 instead of padding: none.
A tag starting with <? has been found within the document, but it’s not supported. Probable causes can be:
- Copy-pasting the contents of an SVG file. If you do that, you should only paste the <svg>...</svg> part, but not the first line with <?xml...>.
- Unprocessed <?...> tags on server scripting languages like PHP, like <?php>
Learn more:
- [freeCodeCamp: How to Use SVG Images in CSS and HTML]https://www.freecodecamp.org/news/use-svg-images-in-css-html/)