Markup Validation Service
Check the markup (HTML, XHTML, …) of Web documents
Markup Validation Service
Check the markup (HTML, XHTML, …) of Web documents
The following notes and warnings highlight missing or conflicting information which caused the validator to perform some guesswork prior to validation, or other things affecting the output below. If the guess or fallback is incorrect, it could make validation results entirely incoherent. It is highly recommended to check these potential issues, and, if necessary, fix them and re-validate the document.
DOCTYPE Override in effect!
The DOCTYPE Declaration for "SVG 1.1" has been inserted at the start of the document, but even if no errors are shown below the document will not be Valid until you add the new DOCTYPE Declaration.
No Character encoding declared at document level
No character encoding information was found within the document, either in an HTML meta element or an XML declaration. It is often recommended to declare the character encoding in the document itself, especially if there is a chance that the document will be read from or saved to disk, CD, etc.
See this tutorial on character encoding for techniques and explanations.
The document located at <https://upload.wikimedia.org/wikipedia/commons/a/a1/Flag_of_East_Germany.svg> was tentatively checked as SVG 1.1. This means that with the use of some fallback or override mechanism, we successfully performed a formal validation of it. In other words, the document would validate as SVG 1.1 if you changed the markup to match the changes we have performed automatically, but it will not be valid until you make these changes. The parser implementations we used for this check are based on OpenSP (SGML/XML) and libxml2 (XML).
If you would like to create a link to this page (i.e., this validation result) to make it easier to revalidate this page in the future or to allow others to validate your page, the URI is <http://validator.w3.org/check?uri=https%3A%2F%2Fupload.wikimedia.org%2Fwikipedia%2Fcommons%2Fa%2Fa1%2FFlag_of_East_Germany.svg;ss=1> (or you can just add the current page to your bookmarks or hotlist).
If you use CSS in your document, you can check it using the W3C CSS Validation Service.
Below is the source input I used for this validation:
