microsoft/playwright · error · Error

"${attr.name}" does not support "${attr.op}" matcher

Error message

"${attr.name}" does not support "${attr.op}" matcher

What it means

Error ""${attr.name}" does not support "${attr.op}" matcher" thrown in microsoft/playwright.

Source

Thrown at packages/injected/src/roleSelectorEngine.ts:58

  includeHidden?: boolean;
};

const kSupportedAttributes = ['selected', 'checked', 'pressed', 'expanded', 'level', 'disabled', 'name', 'description', 'include-hidden'];
kSupportedAttributes.sort();

function validateSupportedRole(attr: string, roles: string[], role: string) {
  if (!roles.includes(role))
    throw new Error(`"${attr}" attribute is only supported for roles: ${roles.slice().sort().map(role => `"${role}"`).join(', ')}`);
}

function validateSupportedValues(attr: AttributeSelectorPart, values: any[]) {
  if (attr.op !== '<truthy>' && !values.includes(attr.value))
    throw new Error(`"${attr.name}" must be one of ${values.map(v => JSON.stringify(v)).join(', ')}`);
}

function validateSupportedOp(attr: AttributeSelectorPart, ops: AttributeSelectorOperator[]) {
  if (!ops.includes(attr.op))
    throw new Error(`"${attr.name}" does not support "${attr.op}" matcher`);
}

function validateAttributes(attrs: AttributeSelectorPart[], role: string): RoleEngineOptions {
  const options: RoleEngineOptions = { role };
  for (const attr of attrs) {
    switch (attr.name) {
      case 'checked': {
        validateSupportedRole(attr.name, kAriaCheckedRoles, role);
        validateSupportedValues(attr, [true, false, 'mixed']);
        validateSupportedOp(attr, ['<truthy>', '=']);
        options.checked = attr.op === '<truthy>' ? true : attr.value;
        break;
      }
      case 'pressed': {
        validateSupportedRole(attr.name, kAriaPressedRoles, role);
        validateSupportedValues(attr, [true, false, 'mixed']);
        validateSupportedOp(attr, ['<truthy>', '=']);
        options.pressed = attr.op === '<truthy>' ? true : attr.value;

View on GitHub (pinned to c8fc3bf8d3)

When it happens

Trigger: Thrown at packages/injected/src/roleSelectorEngine.ts:58 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/82a90c6b690dea60. Report an issue: GitHub.