microsoft/playwright · error · Error

Unknown attribute "${attr.name}", must be one of ${kSupporte

Error message

Unknown attribute "${attr.name}", must be one of ${kSupportedAttributes.map(a => `"${a}"`).join(', ')}.

What it means

Error "Unknown attribute "${attr.name}", must be one of ${kSupportedAttributes.map(a => `"${a}"`).join(', ')}." thrown in microsoft/playwright.

Source

Thrown at packages/injected/src/roleSelectorEngine.ts:136

      }
      case 'description': {
        if (attr.op === '<truthy>')
          throw new Error(`"description" attribute must have a value`);
        if (typeof attr.value !== 'string' && !(attr.value instanceof RegExp))
          throw new Error(`"description" attribute must be a string or a regular expression`);
        options.description = attr.value;
        options.descriptionOp = attr.op;
        options.descriptionExact = attr.caseSensitive;
        break;
      }
      case 'include-hidden': {
        validateSupportedValues(attr, [true, false]);
        validateSupportedOp(attr, ['<truthy>', '=']);
        options.includeHidden = attr.op === '<truthy>' ? true : attr.value;
        break;
      }
      default: {
        throw new Error(`Unknown attribute "${attr.name}", must be one of ${kSupportedAttributes.map(a => `"${a}"`).join(', ')}.`);
      }
    }
  }
  return options;
}

function queryRole(scope: SelectorRoot, options: RoleEngineOptions, internal: boolean): Element[] {
  const result: Element[] = [];
  const match = (element: Element) => {
    if (getAriaRole(element) !== options.role)
      return;
    if (options.selected !== undefined && getAriaSelected(element) !== options.selected)
      return;
    if (options.checked !== undefined && getAriaChecked(element) !== options.checked)
      return;
    if (options.pressed !== undefined && getAriaPressed(element) !== options.pressed)
      return;
    if (options.expanded !== undefined && getAriaExpanded(element) !== options.expanded)

View on GitHub (pinned to c8fc3bf8d3)

When it happens

Trigger: Thrown at packages/injected/src/roleSelectorEngine.ts:136 when the library encounters an invalid state.

Common situations: See trigger scenarios.

AI-assisted analysis of microsoft/playwright@c8fc3bf8d3 (2026-08-12). Data as JSON: /api/errors/9fb9250481f2518f. Report an issue: GitHub.