Header : Invalid html code

Issue Summary

The page has invalid HTML code since elements are nested inappropriately.

Steps to Reproduce

1. Open the Jira Software page
2. Navigate to the header section
3. Using the nu validator observe the invalid HTML code.

Screenshot

Actual Result

The website's HTML code does not validate against the HTML5 specification. For instance, the source code of the page presents 28 errors and 29warnings for duplicate attributes and invalid nesting when checked with the HTML validator. As a result, the HTML validator generated errors.

Expected Result

Ensure that all pages have a valid markup. However, to meet accessibility conformance, it is necessary that the following three main requirements are met:

• All elements are nested properly.

• All elements have start and end tags.

• Within each page, the values of the id attributes are unique.

Workaround

Currently, there is no known workaround for this behaviour. A workaround will be added here when available

Environment

MacBook Pro (14-inch, 2021)
macOs Ventura  13.2.1
Chrome - Version 110.0.5481.100 (Official Build) (64-bit)
Firefox- Version 92.0 (64-bit)
Safari- Version 16.2 (18614.3.7.1.5)
JAWS- Version 2021
NVDA- Version 2021.2
Voiceover - Version Latest