feat(selectors): role selector engine (#12999)

This introduces `role=button[name="Click me"][pressed]` attribute-style
role selector. It is only available under `env.PLAYWRIGHT_EXPERIMENTAL_FEATURES`.

Supported attributes:
- `role` is required, for example `role=button`;
- `name` is accessible name, supports matching operators and regular expressions:
  `role=button[name=/Click(me)?/]`;
- `checked` boolean/mixed, for example `role=checkbox[checked=false]`;
- `selected` boolean, for example `role=option[selected]`;
- `expanded` boolean, for example `role=button[expanded=true]`;
- `disabled` boolean, for example `role=button[disabled]`;
- `level` number, for example `role=heading[level=3]`;
- `pressed` boolean/mixed, for example `role=button[pressed="mixed"]`;
- `includeHidden` - by default, only non-hidden elements are considered.
   Passing `role=button[includeHidden]` matches hidden elements as well.

packages/playwright-core/src/server/dom.ts

@@ -28,7 +28,7 @@ import { Progress, ProgressController } from './progress';
 import { SelectorInfo } from './selectors';
 import * as types from './types';
 import { TimeoutOptions } from '../common/types';
-import { isUnderTest } from '../utils/utils';
+import { experimentalFeaturesEnabled, isUnderTest } from '../utils/utils';
 
 type SetInputFilesFiles = channels.ElementHandleSetInputFilesParams['files'];
 export type InputFilesItems = { files?: SetInputFilesFiles, localPaths?: string[] };
@@ -104,6 +104,7 @@ export class FrameExecutionContext extends js.ExecutionContext {
           ${isUnderTest()},
           ${this.frame._page._delegate.rafCountForStablePosition()},
           "${this.frame._page._browserContext._browser.options.name}",
+          ${experimentalFeaturesEnabled()},
           [${custom.join(',\n')}]
         );
         })();

packages/playwright-core/src/server/injected/componentUtils.ts

@@ -14,10 +14,11 @@
  * limitations under the License.
  */
 
-type Operator = '<truthy>'|'='|'*='|'|='|'^='|'$='|'~=';
+export type ParsedAttributeOperator = '<truthy>'|'='|'*='|'|='|'^='|'$='|'~=';
 export type ParsedComponentAttribute = {
+  name: string,
   jsonPath: string[],
-  op: Operator,
+  op: ParsedAttributeOperator,
   value: any,
   caseSensitive: boolean,
 };
@@ -152,7 +153,7 @@ export function parseComponentSelector(selector: string): ParsedComponentSelecto
     return token;
   }
 
-  function readOperator(): Operator {
+  function readOperator(): ParsedAttributeOperator {
     skipSpaces();
     let op = '';
     if (!EOL)
@@ -161,7 +162,7 @@ export function parseComponentSelector(selector: string): ParsedComponentSelecto
       op += eat1();
     if (!['=', '*=', '^=', '$=', '|=', '~='].includes(op))
       syntaxError('parsing operator');
-    return (op as Operator);
+    return (op as ParsedAttributeOperator);
   }
 
   function readAttribute(): ParsedComponentAttribute {
@@ -182,7 +183,7 @@ export function parseComponentSelector(selector: string): ParsedComponentSelecto
     // check property is truthy: [enabled]
     if (next() === ']') {
       eat1();
-      return { jsonPath, op: '<truthy>', value: null, caseSensitive: false };
+      return { name: jsonPath.join('.'), jsonPath, op: '<truthy>', value: null, caseSensitive: false };
     }
 
     const operator = readOperator();
@@ -225,7 +226,7 @@ export function parseComponentSelector(selector: string): ParsedComponentSelecto
     eat1();
     if (operator !== '=' && typeof value !== 'string')
       throw new Error(`Error while parsing selector \`${selector}\` - cannot use ${operator} in attribute with non-string matching value - ${value}`);
-    return { jsonPath, op: operator, value, caseSensitive };
+    return { name: jsonPath.join('.'), jsonPath, op: operator, value, caseSensitive };
   }
 
   const result: ParsedComponentSelector = {

packages/playwright-core/src/server/injected/injectedScript.ts

@@ -18,13 +18,14 @@ import { SelectorEngine, SelectorRoot } from './selectorEngine';
 import { XPathEngine } from './xpathSelectorEngine';
 import { ReactEngine } from './reactSelectorEngine';
 import { VueEngine } from './vueSelectorEngine';
+import { RoleEngine } from './roleSelectorEngine';
 import { allEngineNames, ParsedSelector, ParsedSelectorPart, parseSelector, stringifySelector } from '../common/selectorParser';
 import { SelectorEvaluatorImpl, isVisible, parentElementOrShadowHost, elementMatchesText, TextMatcher, createRegexTextMatcher, createStrictTextMatcher, createLaxTextMatcher } from './selectorEvaluator';
 import { CSSComplexSelectorList } from '../common/cssParser';
 import { generateSelector } from './selectorGenerator';
 import type * as channels from '../../protocol/channels';
 import { Highlight } from './highlight';
-import { getElementAccessibleName } from './roleUtils';
+import { getAriaDisabled, getElementAccessibleName } from './roleUtils';
 
 type Predicate<T> = (progress: InjectedScriptProgress) => T | symbol;
 
@@ -79,7 +80,7 @@ export class InjectedScript {
   private _highlight: Highlight | undefined;
   readonly isUnderTest: boolean;
 
-  constructor(isUnderTest: boolean, stableRafCount: number, browserName: string, customEngines: { name: string, engine: SelectorEngine}[]) {
+  constructor(isUnderTest: boolean, stableRafCount: number, browserName: string, experimentalFeaturesEnabled: boolean, customEngines: { name: string, engine: SelectorEngine}[]) {
     this.isUnderTest = isUnderTest;
     this._evaluator = new SelectorEvaluatorImpl(new Map());
 
@@ -88,6 +89,8 @@ export class InjectedScript {
     this._engines.set('xpath:light', XPathEngine);
     this._engines.set('_react', ReactEngine);
     this._engines.set('_vue', VueEngine);
+    if (experimentalFeaturesEnabled)
+      this._engines.set('role', RoleEngine);
     this._engines.set('text', this._createTextEngine(true));
     this._engines.set('text:light', this._createTextEngine(false));
     this._engines.set('id', this._createAttributeEngine('id', true));
@@ -515,7 +518,7 @@ export class InjectedScript {
     if (state === 'hidden')
       return !this.isVisible(element);
 
-    const disabled = isElementDisabled(element);
+    const disabled = getAriaDisabled(element);
     if (state === 'disabled')
       return disabled;
     if (state === 'enabled')
@@ -1250,35 +1253,4 @@ function deepEquals(a: any, b: any): boolean {
   return false;
 }
 
-function isElementDisabled(element: Element): boolean {
-  const isRealFormControl = ['BUTTON', 'INPUT', 'SELECT', 'TEXTAREA', 'OPTION', 'OPTGROUP'].includes(element.nodeName);
-  if (isRealFormControl && element.hasAttribute('disabled'))
-    return true;
-  if (isRealFormControl && hasDisabledFieldSet(element))
-    return true;
-  if (hasAriaDisabled(element))
-    return true;
-  return false;
-}
-
-function hasDisabledFieldSet(element: Element|null): boolean {
-  if (!element)
-    return false;
-  if (element.tagName === 'FIELDSET' && element.hasAttribute('disabled'))
-    return true;
-  // fieldset does not work across shadow boundaries
-  return hasDisabledFieldSet(element.parentElement);
-}
-function hasAriaDisabled(element: Element|undefined): boolean {
-  if (!element)
-    return false;
-  const attribute = (element.getAttribute('aria-disabled') || '').toLowerCase();
-  if (attribute === 'true')
-    return true;
-  if (attribute === 'false')
-    return false;
-  return hasAriaDisabled(parentElementOrShadowHost(element));
-}
-
-
 export default InjectedScript;

packages/playwright-core/src/server/injected/roleSelectorEngine.ts

@@ -0,0 +1,158 @@
+/**
+ * Copyright (c) Microsoft Corporation.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+import { SelectorEngine, SelectorRoot } from './selectorEngine';
+import { matchesAttribute, parseComponentSelector, ParsedComponentAttribute, ParsedAttributeOperator } from './componentUtils';
+import { getAriaChecked, getAriaDisabled, getAriaExpanded, getAriaLevel, getAriaPressed, getAriaRole, getAriaSelected, getElementAccessibleName, isElementHiddenForAria, kAriaCheckedRoles, kAriaExpandedRoles, kAriaLevelRoles, kAriaPressedRoles, kAriaSelectedRoles } from './roleUtils';
+
+const kSupportedAttributes = ['selected', 'checked', 'pressed', 'expanded', 'level', 'disabled', 'name', 'includeHidden'];
+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: ParsedComponentAttribute, values: any[]) {
+  if (attr.op !== '<truthy>' && !values.includes(attr.value))
+    throw new Error(`"${attr.name}" must be one of ${values.map(v => JSON.stringify(v)).join(', ')}`);
+}
+
+function validateSupportedOp(attr: ParsedComponentAttribute, ops: ParsedAttributeOperator[]) {
+  if (!ops.includes(attr.op))
+    throw new Error(`"${attr.name}" does not support "${attr.op}" matcher`);
+}
+
+function validateAttributes(attrs: ParsedComponentAttribute[], role: string) {
+  for (const attr of attrs) {
+    switch (attr.name) {
+      case 'checked': {
+        validateSupportedRole(attr.name, kAriaCheckedRoles, role);
+        validateSupportedValues(attr, [true, false, 'mixed']);
+        validateSupportedOp(attr, ['<truthy>', '=']);
+        break;
+      }
+      case 'pressed': {
+        validateSupportedRole(attr.name, kAriaPressedRoles, role);
+        validateSupportedValues(attr, [true, false, 'mixed']);
+        validateSupportedOp(attr, ['<truthy>', '=']);
+        break;
+      }
+      case 'selected': {
+        validateSupportedRole(attr.name, kAriaSelectedRoles, role);
+        validateSupportedValues(attr, [true, false]);
+        validateSupportedOp(attr, ['<truthy>', '=']);
+        break;
+      }
+      case 'expanded': {
+        validateSupportedRole(attr.name, kAriaExpandedRoles, role);
+        validateSupportedValues(attr, [true, false]);
+        validateSupportedOp(attr, ['<truthy>', '=']);
+        break;
+      }
+      case 'level': {
+        validateSupportedRole(attr.name, kAriaLevelRoles, role);
+        if (attr.op !== '=' || typeof attr.value !== 'number')
+          throw new Error(`"level" attribute must be compared to a number`);
+        break;
+      }
+      case 'disabled': {
+        validateSupportedValues(attr, [true, false]);
+        validateSupportedOp(attr, ['<truthy>', '=']);
+        break;
+      }
+      case 'name': {
+        if (attr.op !== '<truthy>' && typeof attr.value !== 'string' && !(attr.value instanceof RegExp))
+          throw new Error(`"name" attribute must be a string or a regular expression`);
+        break;
+      }
+      case 'includeHidden': {
+        validateSupportedValues(attr, [true, false]);
+        validateSupportedOp(attr, ['<truthy>', '=']);
+        break;
+      }
+      default: {
+        throw new Error(`Unknown attribute "${attr.name}", must be one of ${kSupportedAttributes.map(a => `"${a}"`).join(', ')}.`);
+      }
+    }
+  }
+}
+
+export const RoleEngine: SelectorEngine = {
+  queryAll(scope: SelectorRoot, selector: string): Element[] {
+    const parsed = parseComponentSelector(selector);
+    const role = parsed.name.toLowerCase();
+    if (!role)
+      throw new Error(`Role must not be empty`);
+    validateAttributes(parsed.attributes, role);
+
+    const hiddenCache = new Map<Element, boolean>();
+    const result: Element[] = [];
+    const match = (element: Element) => {
+      if (getAriaRole(element) !== role)
+        return;
+      let includeHidden = false;  // By default, hidden elements are excluded.
+      let nameAttr: ParsedComponentAttribute | undefined;
+      for (const attr of parsed.attributes) {
+        if (attr.name === 'includeHidden') {
+          includeHidden = attr.op === '<truthy>' || !!attr.value;
+          continue;
+        }
+        if (attr.name === 'name') {
+          nameAttr = attr;
+          continue;
+        }
+        let actual;
+        switch (attr.name) {
+          case 'selected': actual = getAriaSelected(element); break;
+          case 'checked': actual = getAriaChecked(element); break;
+          case 'pressed': actual = getAriaPressed(element); break;
+          case 'expanded': actual = getAriaExpanded(element); break;
+          case 'level': actual = getAriaLevel(element); break;
+          case 'disabled': actual = getAriaDisabled(element); break;
+        }
+        if (!matchesAttribute(actual, attr))
+          return;
+      }
+      if (!includeHidden) {
+        const isHidden = isElementHiddenForAria(element, hiddenCache);
+        if (isHidden)
+          return;
+      }
+      if (nameAttr !== undefined) {
+        const accessibleName = getElementAccessibleName(element, includeHidden, hiddenCache);
+        if (!matchesAttribute(accessibleName, nameAttr))
+          return;
+      }
+      result.push(element);
+    };
+
+    const query = (root: Element | ShadowRoot | Document) => {
+      const shadows: ShadowRoot[] = [];
+      if ((root as Element).shadowRoot)
+        shadows.push((root as Element).shadowRoot!);
+      for (const element of root.querySelectorAll('*')) {
+        match(element);
+        if (element.shadowRoot)
+          shadows.push(element.shadowRoot);
+      }
+      shadows.forEach(query);
+    };
+
+    query(scope);
+    return result;
+  }
+};

packages/playwright-core/src/server/injected/roleUtils.ts

@@ -199,8 +199,8 @@ const validRoles = allRoles.filter(role => !abstractRoles.includes(role));
 
 function getExplicitAriaRole(element: Element): string | null {
   // https://www.w3.org/TR/wai-aria-1.2/#document-handling_author-errors_roles
-  const explicitRole = (element.getAttribute('role') || '').trim().split(' ')[0];
+  const roles = (element.getAttribute('role') || '').split(' ').map(role => role.trim());
-  return validRoles.includes(explicitRole) ? explicitRole : null;
+  return roles.find(role => validRoles.includes(role)) || null;
 }
 
 function hasPresentationConflictResolution(element: Element) {
@@ -209,7 +209,7 @@ function hasPresentationConflictResolution(element: Element) {
   return !hasGlobalAriaAttribute(element);
 }
 
-function getAriaRole(element: Element): string | null {
+export function getAriaRole(element: Element): string | null {
   const explicitRole = getExplicitAriaRole(element);
   if (!explicitRole)
     return getImplicitAriaRole(element);
@@ -226,27 +226,29 @@ function getComputedStyle(element: Element, pseudo?: string): CSSStyleDeclaratio
   return element.ownerDocument && element.ownerDocument.defaultView ? element.ownerDocument.defaultView.getComputedStyle(element, pseudo) : undefined;
 }
 
+// https://www.w3.org/TR/wai-aria-1.2/#tree_exclusion, but including "none" and "presentation" roles
+// https://www.w3.org/TR/wai-aria-1.2/#aria-hidden
 export function isElementHiddenForAria(element: Element, cache: Map<Element, boolean>): boolean {
   if (['STYLE', 'SCRIPT', 'NOSCRIPT', 'TEMPLATE'].includes(element.tagName))
     return true;
-
+  const style: CSSStyleDeclaration | undefined = getComputedStyle(element);
-  let style: CSSStyleDeclaration | undefined = getComputedStyle(element);
   if (!style || style.visibility === 'hidden')
     return true;
+  return belongsToDisplayNoneOrAriaHidden(element, cache);
+}
 
-  let parent: Element | undefined = element;
+function belongsToDisplayNoneOrAriaHidden(element: Element, cache: Map<Element, boolean>): boolean {
-  while (parent) {
+  if (!cache.has(element)) {
-    if (!cache.has(parent)) {
+    const style = getComputedStyle(element);
-      if (!style)
+    let hidden = !style || style.display === 'none' || getAriaBoolean(element.getAttribute('aria-hidden')) === true;
-        style = getComputedStyle(parent);
+    if (!hidden) {
-      const hidden = !style || style.display === 'none' || getAriaBoolean(parent.getAttribute('aria-hidden')) === true;
+      const parent = parentElementOrShadowHost(element);
-      cache.set(parent, hidden);
+      if (parent)
+        hidden = hidden || belongsToDisplayNoneOrAriaHidden(parent, cache);
     }
-    if (cache.get(parent)!)
+    cache.set(element, hidden);
-      return true;
-    parent = parentElementOrShadowHost(parent);
   }
-  return false;
+  return cache.get(element)!;
 }
 
 function getIdRefs(element: Element, ref: string | null): Element[] {
@@ -609,3 +611,106 @@ function getElementAccessibleNameInternal(element: Element, options: AccessibleN
   options.visitedElements.add(element);
   return '';
 }
+
+export const kAriaSelectedRoles = ['gridcell', 'option', 'row', 'tab', 'rowheader', 'columnheader', 'treeitem'];
+export function getAriaSelected(element: Element): boolean {
+  // https://www.w3.org/TR/wai-aria-1.2/#aria-selected
+  // https://www.w3.org/TR/html-aam-1.0/#html-attribute-state-and-property-mappings
+  if (element.tagName === 'OPTION')
+    return (element as HTMLOptionElement).selected;
+  if (kAriaSelectedRoles.includes(getAriaRole(element) || ''))
+    return getAriaBoolean(element.getAttribute('aria-selected')) === true;
+  return false;
+}
+
+export const kAriaCheckedRoles = ['checkbox', 'menuitemcheckbox', 'option', 'radio', 'switch', 'menuitemradio', 'treeitem'];
+export function getAriaChecked(element: Element): boolean | 'mixed' {
+  // https://www.w3.org/TR/wai-aria-1.2/#aria-checked
+  // https://www.w3.org/TR/html-aam-1.0/#html-attribute-state-and-property-mappings
+  if (element.tagName === 'INPUT' && (element as HTMLInputElement).indeterminate)
+    return 'mixed';
+  if (element.tagName === 'INPUT' && ['checkbox', 'radio'].includes((element as HTMLInputElement).type))
+    return (element as HTMLInputElement).checked;
+  if (kAriaCheckedRoles.includes(getAriaRole(element) || '')) {
+    const checked = element.getAttribute('aria-checked');
+    if (checked === 'true')
+      return true;
+    if (checked === 'mixed')
+      return 'mixed';
+  }
+  return false;
+}
+
+export const kAriaPressedRoles = ['button'];
+export function getAriaPressed(element: Element): boolean | 'mixed' {
+  // https://www.w3.org/TR/wai-aria-1.2/#aria-pressed
+  if (kAriaPressedRoles.includes(getAriaRole(element) || '')) {
+    const pressed = element.getAttribute('aria-pressed');
+    if (pressed === 'true')
+      return true;
+    if (pressed === 'mixed')
+      return 'mixed';
+  }
+  return false;
+}
+
+export const kAriaExpandedRoles = ['application', 'button', 'checkbox', 'combobox', 'gridcell', 'link', 'listbox', 'menuitem', 'row', 'rowheader', 'tab', 'treeitem', 'columnheader', 'menuitemcheckbox', 'menuitemradio', 'rowheader', 'switch'];
+export function getAriaExpanded(element: Element): boolean {
+  // https://www.w3.org/TR/wai-aria-1.2/#aria-expanded
+  // https://www.w3.org/TR/html-aam-1.0/#html-attribute-state-and-property-mappings
+  if (element.tagName === 'DETAILS')
+    return (element as HTMLDetailsElement).open;
+  if (kAriaExpandedRoles.includes(getAriaRole(element) || ''))
+    return getAriaBoolean(element.getAttribute('aria-expanded')) === true;
+  return false;
+}
+
+export const kAriaLevelRoles = ['heading', 'listitem', 'row', 'treeitem'];
+export function getAriaLevel(element: Element) {
+  // https://www.w3.org/TR/wai-aria-1.2/#aria-level
+  // https://www.w3.org/TR/html-aam-1.0/#html-attribute-state-and-property-mappings
+  const native = { 'H1': 1, 'H2': 2, 'H3': 3, 'H4': 4, 'H5': 5, 'H6': 6 }[element.tagName];
+  if (native)
+    return native;
+  if (kAriaLevelRoles.includes(getAriaRole(element) || '')) {
+    const attr = element.getAttribute('aria-level');
+    const value = attr === null ? Number.NaN : Number(attr);
+    if (Number.isInteger(value) && value >= 1)
+      return value;
+  }
+  return 0;
+}
+
+export const kAriaDisabledRoles = ['application', 'button', 'composite', 'gridcell', 'group', 'input', 'link', 'menuitem', 'scrollbar', 'separator', 'tab', 'checkbox', 'columnheader', 'combobox', 'grid', 'listbox', 'menu', 'menubar', 'menuitemcheckbox', 'menuitemradio', 'option', 'radio', 'radiogroup', 'row', 'rowheader', 'searchbox', 'select', 'slider', 'spinbutton', 'switch', 'tablist', 'textbox', 'toolbar', 'tree', 'treegrid', 'treeitem'];
+export function getAriaDisabled(element: Element): boolean {
+  // https://www.w3.org/TR/wai-aria-1.2/#aria-disabled
+  // https://www.w3.org/TR/html-aam-1.0/#html-attribute-state-and-property-mappings
+  // Note that aria-disabled applies to all descendants, so we look up the hierarchy.
+  const isNativeFormControl = ['BUTTON', 'INPUT', 'SELECT', 'TEXTAREA', 'OPTION', 'OPTGROUP'].includes(element.tagName);
+  if (isNativeFormControl && (element.hasAttribute('disabled') || belongsToDisabledFieldSet(element)))
+    return true;
+  return hasExplicitAriaDisabled(element);
+}
+
+function belongsToDisabledFieldSet(element: Element | null): boolean {
+  if (!element)
+    return false;
+  if (element.tagName === 'FIELDSET' && element.hasAttribute('disabled'))
+    return true;
+  // fieldset does not work across shadow boundaries.
+  return belongsToDisabledFieldSet(element.parentElement);
+}
+
+function hasExplicitAriaDisabled(element: Element | undefined): boolean {
+  if (!element)
+    return false;
+  if (kAriaDisabledRoles.includes(getAriaRole(element) || '')) {
+    const attribute = (element.getAttribute('aria-disabled') || '').toLowerCase();
+    if (attribute === 'true')
+      return true;
+    if (attribute === 'false')
+      return false;
+  }
+  // aria-disabled works across shadow boundaries.
+  return hasExplicitAriaDisabled(parentElementOrShadowHost(element));
+}

packages/playwright-core/src/server/selectors.ts

@@ -19,7 +19,7 @@ import * as frames from './frames';
 import * as js from './javascript';
 import * as types from './types';
 import { allEngineNames, InvalidSelectorError, ParsedSelector, parseSelector, stringifySelector } from './common/selectorParser';
-import { createGuid } from '../utils/utils';
+import { createGuid, experimentalFeaturesEnabled } from '../utils/utils';
 
 export type SelectorInfo = {
   parsed: ParsedSelector,
@@ -133,6 +133,8 @@ export class Selectors {
   }
 
   parseSelector(selector: string | ParsedSelector, strict: boolean): SelectorInfo {
+    if (experimentalFeaturesEnabled())
+      this._builtinEngines.add('role');
     const parsed = typeof selector === 'string' ? parseSelector(selector) : selector;
     let needsMainWorld = false;
     for (const name of allEngineNames(parsed)) {

packages/playwright-core/src/utils/utils.ts

@@ -338,6 +338,10 @@ export function isUnderTest(): boolean {
   return _isUnderTest;
 }
 
+export function experimentalFeaturesEnabled() {
+  return isUnderTest() || !!process.env.PLAYWRIGHT_EXPERIMENTAL_FEATURES;
+}
+
 export function getFromENV(name: string): string | undefined {
   let value = process.env[name];
   value = value === undefined ? process.env[`npm_config_${name.toLowerCase()}`] : value;

tests/page/elementhandle-wait-for-element-state.spec.ts

@@ -126,7 +126,7 @@ it('should wait for aria enabled button', async ({ page }) => {
 });
 
 it('should wait for button with an aria-disabled parent', async ({ page }) => {
-  await page.setContent('<div aria-disabled=true><button><span>Target</span></button></div>');
+  await page.setContent('<div role="group" aria-disabled=true><button><span>Target</span></button></div>');
   const span = await page.$('text=Target');
   let done = false;
   const promise = span.waitForElementState('enabled').then(() => done = true);

tests/page/selectors-role.spec.ts

@@ -0,0 +1,305 @@
+/**
+ * Copyright (c) Microsoft Corporation.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+import { test, expect } from './pageTest';
+
+test('should detect roles', async ({ page }) => {
+  await page.setContent(`
+    <button>Hello</button>
+    <select multiple="" size="2"></select>
+    <select></select>
+    <h3>Heading</h3>
+    <details><summary>Hello</summary></details>
+    <div role="dialog">I am a dialog</div>
+  `);
+  expect(await page.$$eval(`role=button`, els => els.map(e => e.outerHTML))).toEqual([
+    `<button>Hello</button>`,
+  ]);
+  expect(await page.$$eval(`role=listbox`, els => els.map(e => e.outerHTML))).toEqual([
+    `<select multiple="" size="2"></select>`,
+  ]);
+  expect(await page.$$eval(`role=combobox`, els => els.map(e => e.outerHTML))).toEqual([
+    `<select></select>`,
+  ]);
+  expect(await page.$$eval(`role=heading`, els => els.map(e => e.outerHTML))).toEqual([
+    `<h3>Heading</h3>`,
+  ]);
+  expect(await page.$$eval(`role=group`, els => els.map(e => e.outerHTML))).toEqual([
+    `<details><summary>Hello</summary></details>`,
+  ]);
+  expect(await page.$$eval(`role=dialog`, els => els.map(e => e.outerHTML))).toEqual([
+    `<div role="dialog">I am a dialog</div>`,
+  ]);
+  expect(await page.$$eval(`role=menuitem`, els => els.map(e => e.outerHTML))).toEqual([
+  ]);
+});
+
+test('should support selected', async ({ page }) => {
+  await page.setContent(`
+    <select>
+      <option>Hi</option>
+      <option selected>Hello</option>
+    </select>
+    <div>
+      <div role="option" aria-selected="true">Hi</div>
+      <div role="option" aria-selected="false">Hello</div>
+    </div>
+  `);
+  expect(await page.$$eval(`role=option[selected]`, els => els.map(e => e.outerHTML))).toEqual([
+    `<option selected="">Hello</option>`,
+    `<div role="option" aria-selected="true">Hi</div>`,
+  ]);
+  expect(await page.$$eval(`role=option[selected=true]`, els => els.map(e => e.outerHTML))).toEqual([
+    `<option selected="">Hello</option>`,
+    `<div role="option" aria-selected="true">Hi</div>`,
+  ]);
+  expect(await page.$$eval(`role=option[selected=false]`, els => els.map(e => e.outerHTML))).toEqual([
+    `<option>Hi</option>`,
+    `<div role="option" aria-selected="false">Hello</div>`,
+  ]);
+});
+
+test('should support checked', async ({ page }) => {
+  await page.setContent(`
+    <input type=checkbox>
+    <input type=checkbox checked>
+    <input type=checkbox indeterminate>
+    <div role=checkbox aria-checked="true">Hi</div>
+    <div role=checkbox aria-checked="false">Hello</div>
+    <div role=checkbox>Unknown</div>
+  `);
+  await page.$eval('[indeterminate]', input => (input as HTMLInputElement).indeterminate = true);
+  expect(await page.$$eval(`role=checkbox[checked]`, els => els.map(e => e.outerHTML))).toEqual([
+    `<input type="checkbox" checked="">`,
+    `<input type="checkbox" indeterminate="">`,
+    `<div role="checkbox" aria-checked="true">Hi</div>`,
+  ]);
+  expect(await page.$$eval(`role=checkbox[checked=true]`, els => els.map(e => e.outerHTML))).toEqual([
+    `<input type="checkbox" checked="">`,
+    `<div role="checkbox" aria-checked="true">Hi</div>`,
+  ]);
+  expect(await page.$$eval(`role=checkbox[checked=false]`, els => els.map(e => e.outerHTML))).toEqual([
+    `<input type="checkbox">`,
+    `<div role="checkbox" aria-checked="false">Hello</div>`,
+    `<div role="checkbox">Unknown</div>`,
+  ]);
+  expect(await page.$$eval(`role=checkbox`, els => els.map(e => e.outerHTML))).toEqual([
+    `<input type="checkbox">`,
+    `<input type="checkbox" checked="">`,
+    `<input type="checkbox" indeterminate="">`,
+    `<div role="checkbox" aria-checked="true">Hi</div>`,
+    `<div role="checkbox" aria-checked="false">Hello</div>`,
+    `<div role="checkbox">Unknown</div>`,
+  ]);
+});
+
+test('should support pressed', async ({ page }) => {
+  await page.setContent(`
+    <button>Hi</button>
+    <button aria-pressed="true">Hello</button>
+    <button aria-pressed="false">Bye</button>
+    <button aria-pressed="mixed">Mixed</button>
+  `);
+  expect(await page.$$eval(`role=button[pressed]`, els => els.map(e => e.outerHTML))).toEqual([
+    `<button aria-pressed="true">Hello</button>`,
+    `<button aria-pressed="mixed">Mixed</button>`,
+  ]);
+  expect(await page.$$eval(`role=button[pressed=true]`, els => els.map(e => e.outerHTML))).toEqual([
+    `<button aria-pressed="true">Hello</button>`,
+  ]);
+  expect(await page.$$eval(`role=button[pressed=false]`, els => els.map(e => e.outerHTML))).toEqual([
+    `<button>Hi</button>`,
+    `<button aria-pressed="false">Bye</button>`,
+  ]);
+  expect(await page.$$eval(`role=button[pressed="mixed"]`, els => els.map(e => e.outerHTML))).toEqual([
+    `<button aria-pressed="mixed">Mixed</button>`,
+  ]);
+});
+
+test('should support expanded', async ({ page }) => {
+  await page.setContent(`
+    <button>Hi</button>
+    <button aria-expanded="true">Hello</button>
+    <button aria-expanded="false">Bye</button>
+  `);
+  expect(await page.$$eval(`role=button[expanded]`, els => els.map(e => e.outerHTML))).toEqual([
+    `<button aria-expanded="true">Hello</button>`,
+  ]);
+  expect(await page.$$eval(`role=button[expanded=true]`, els => els.map(e => e.outerHTML))).toEqual([
+    `<button aria-expanded="true">Hello</button>`,
+  ]);
+  expect(await page.$$eval(`role=button[expanded=false]`, els => els.map(e => e.outerHTML))).toEqual([
+    `<button>Hi</button>`,
+    `<button aria-expanded="false">Bye</button>`,
+  ]);
+});
+
+test('should support disabled', async ({ page }) => {
+  await page.setContent(`
+    <button>Hi</button>
+    <button disabled>Bye</button>
+    <button aria-disabled="true">Hello</button>
+    <button aria-disabled="false">Oh</button>
+    <fieldset disabled>
+      <button>Yay</button>
+    </fieldset>
+  `);
+  expect(await page.$$eval(`role=button[disabled]`, els => els.map(e => e.outerHTML))).toEqual([
+    `<button disabled="">Bye</button>`,
+    `<button aria-disabled="true">Hello</button>`,
+    `<button>Yay</button>`,
+  ]);
+  expect(await page.$$eval(`role=button[disabled=true]`, els => els.map(e => e.outerHTML))).toEqual([
+    `<button disabled="">Bye</button>`,
+    `<button aria-disabled="true">Hello</button>`,
+    `<button>Yay</button>`,
+  ]);
+  expect(await page.$$eval(`role=button[disabled=false]`, els => els.map(e => e.outerHTML))).toEqual([
+    `<button>Hi</button>`,
+    `<button aria-disabled="false">Oh</button>`,
+  ]);
+});
+
+test('should support level', async ({ page }) => {
+  await page.setContent(`
+    <h1>Hello</h1>
+    <h3>Hi</h3>
+    <div role="heading" aria-level="5">Bye</div>
+  `);
+  expect(await page.$$eval(`role=heading[level=1]`, els => els.map(e => e.outerHTML))).toEqual([
+    `<h1>Hello</h1>`,
+  ]);
+  expect(await page.$$eval(`role=heading[level=3]`, els => els.map(e => e.outerHTML))).toEqual([
+    `<h3>Hi</h3>`,
+  ]);
+  expect(await page.$$eval(`role=heading[level=5]`, els => els.map(e => e.outerHTML))).toEqual([
+    `<div role="heading" aria-level="5">Bye</div>`,
+  ]);
+});
+
+test('should filter hidden, unless explicitly asked for', async ({ page }) => {
+  await page.setContent(`
+    <button>Hi</button>
+    <button hidden>Hello</button>
+    <button aria-hidden="true">Yay</button>
+    <button aria-hidden="false">Nay</button>
+    <button style="visibility:hidden">Bye</button>
+    <div style="visibility:hidden">
+      <button>Oh</button>
+    </div>
+    <div style="visibility:hidden">
+      <button style="visibility:visible">Still here</button>
+    </div>
+    <button style="display:none">Never</button>
+    <div id=host1></div>
+    <div id=host2 style="display:none"></div>
+    <script>
+      function addButton(host, text) {
+        const root = host.attachShadow({ mode: 'open' });
+        const button = document.createElement('button');
+        button.textContent = text;
+        root.appendChild(button);
+      }
+      addButton(document.getElementById('host1'), 'Shadow1');
+      addButton(document.getElementById('host2'), 'Shadow2');
+    </script>
+  `);
+  expect(await page.$$eval(`role=button`, els => els.map(e => e.outerHTML))).toEqual([
+    `<button>Hi</button>`,
+    `<button aria-hidden="false">Nay</button>`,
+    `<button style="visibility:visible">Still here</button>`,
+    `<button>Shadow1</button>`,
+  ]);
+  expect(await page.$$eval(`role=button[includeHidden]`, els => els.map(e => e.outerHTML))).toEqual([
+    `<button>Hi</button>`,
+    `<button hidden="">Hello</button>`,
+    `<button aria-hidden="true">Yay</button>`,
+    `<button aria-hidden="false">Nay</button>`,
+    `<button style="visibility:hidden">Bye</button>`,
+    `<button>Oh</button>`,
+    `<button style="visibility:visible">Still here</button>`,
+    `<button style="display:none">Never</button>`,
+    `<button>Shadow1</button>`,
+    `<button>Shadow2</button>`,
+  ]);
+  expect(await page.$$eval(`role=button[includeHidden=true]`, els => els.map(e => e.outerHTML))).toEqual([
+    `<button>Hi</button>`,
+    `<button hidden="">Hello</button>`,
+    `<button aria-hidden="true">Yay</button>`,
+    `<button aria-hidden="false">Nay</button>`,
+    `<button style="visibility:hidden">Bye</button>`,
+    `<button>Oh</button>`,
+    `<button style="visibility:visible">Still here</button>`,
+    `<button style="display:none">Never</button>`,
+    `<button>Shadow1</button>`,
+    `<button>Shadow2</button>`,
+  ]);
+  expect(await page.$$eval(`role=button[includeHidden=false]`, els => els.map(e => e.outerHTML))).toEqual([
+    `<button>Hi</button>`,
+    `<button aria-hidden="false">Nay</button>`,
+    `<button style="visibility:visible">Still here</button>`,
+    `<button>Shadow1</button>`,
+  ]);
+});
+
+test('should support name', async ({ page }) => {
+  await page.setContent(`
+    <div role="button" aria-label="Hello"></div>
+    <div role="button" aria-label="Hallo"></div>
+    <div role="button" aria-label="Hello" aria-hidden="true"></div>
+  `);
+  expect(await page.$$eval(`role=button[name="Hello"]`, els => els.map(e => e.outerHTML))).toEqual([
+    `<div role="button" aria-label="Hello"></div>`,
+  ]);
+  expect(await page.$$eval(`role=button[name*="all"]`, els => els.map(e => e.outerHTML))).toEqual([
+    `<div role="button" aria-label="Hallo"></div>`,
+  ]);
+  expect(await page.$$eval(`role=button[name=/^H[ae]llo$/]`, els => els.map(e => e.outerHTML))).toEqual([
+    `<div role="button" aria-label="Hello"></div>`,
+    `<div role="button" aria-label="Hallo"></div>`,
+  ]);
+  expect(await page.$$eval(`role=button[name=/h.*o/i]`, els => els.map(e => e.outerHTML))).toEqual([
+    `<div role="button" aria-label="Hello"></div>`,
+    `<div role="button" aria-label="Hallo"></div>`,
+  ]);
+  expect(await page.$$eval(`role=button[name="Hello"][includeHidden]`, els => els.map(e => e.outerHTML))).toEqual([
+    `<div role="button" aria-label="Hello"></div>`,
+    `<div role="button" aria-label="Hello" aria-hidden="true"></div>`,
+  ]);
+});
+
+test('errors', async ({ page }) => {
+  const e0 = await page.$('role=[bar]').catch(e => e);
+  expect(e0.message).toContain(`Role must not be empty`);
+
+  const e1 = await page.$('role=foo[sElected]').catch(e => e);
+  expect(e1.message).toContain(`Unknown attribute "sElected", must be one of "checked", "disabled", "expanded", "includeHidden", "level", "name", "pressed", "selected"`);
+
+  const e2 = await page.$('role=foo[bar . qux=true]').catch(e => e);
+  expect(e2.message).toContain(`Unknown attribute "bar.qux"`);
+
+  const e3 = await page.$('role=heading[level="bar"]').catch(e => e);
+  expect(e3.message).toContain(`"level" attribute must be compared to a number`);
+
+  const e4 = await page.$('role=checkbox[checked="bar"]').catch(e => e);
+  expect(e4.message).toContain(`"checked" must be one of true, false, "mixed"`);
+
+  const e5 = await page.$('role=checkbox[checked~=true]').catch(e => e);
+  expect(e5.message).toContain(`cannot use ~= in attribute with non-string matching value`);
+
+  const e6 = await page.$('role=button[level=3]').catch(e => e);
+  expect(e6.message).toContain(`"level" attribute is only supported for roles: "heading", "listitem", "row", "treeitem"`);
+});