Unknown and framework attributes pass without errors
The validator does not flag unknown attributes, including framework attributes such as x-data and @click.
Tier II · Emerging Problems that are still building up.
3 public reports · first reported 14 February 2020 · last reported 11 May 2026
What's going wrong
Users report that attributes not defined in HTML, such as framework attributes like x-data or @click, pass silently.
AI-assisted: written with the help of AI from the reports. The idea report has the full summary.
In the idea report
- The full summary.
- The products the 3 reports are about, and how many came each month.
- Related problems.
No business has been found with this problem yet, so the report has no contacts. All sales are final — no refunds. Pricing.