# class:accessibility ### class: Accessibility v0.9.0 The Accessibility class provides methods for inspecting Chromium's accessibility tree. The accessibility tree is used by assistive technology such as [screen readers](https://en.wikipedia.org/wiki/Screen_reader). Accessibility is a very platform-specific thing. On different platforms, there are different screen readers that might have wildly different output. Blink - Chrome's rendering engine - has a concept of "accessibility tree", which is than translated into different platform-specific APIs. Accessibility namespace gives users access to the Blink Accessibility Tree. Most of the accessibility tree gets filtered out when converting from Blink AX Tree to Platform-specific AX-Tree or by screen readers themselves. By default, Puppeteer tries to approximate this filtering, exposing only the "interesting" nodes of the tree. #### Methods - [accessibility.snapshot(\[options\])](#?product=Puppeteer&version=v1.11.0&show=api-accessibilitysnapshotoptions)v0.9.0 ### Methods #### accessibility.snapshot(\[options\])v0.9.0 - `options` <[Object](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Object "Object")> - `interestingOnly` <[boolean](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Data_structures#Boolean_type "Boolean")> Prune uninteresting nodes from the tree. Defaults to `true`. - returns: <[Promise](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Promise "Promise")<[Object](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Object "Object")>> Returns an [AXNode](#?product=Puppeteer&version=v1.11.0&show=api-accessibilitysnapshotoptions "AXNode") object with the following properties: - `role` <[string](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Data_structures#String_type "String")> The [role](https://www.w3.org/TR/wai-aria/#usage_intro). - `name` <[string](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Data_structures#String_type "String")> A human readable name for the node. - `value` <[string](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Data_structures#String_type "String")|[number](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Data_structures#Number_type "Number")> The current value of the node. - `description` <[string](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Data_structures#String_type "String")> An additional human readable description of the node. - `keyshortcuts` <[string](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Data_structures#String_type "String")> Keyboard shortcuts associated with this node. - `roledescription` <[string](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Data_structures#String_type "String")> A human readable alternative to the role. - `valuetext` <[string](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Data_structures#String_type "String")> A description of the current value. - `disabled` <[boolean](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Data_structures#Boolean_type "Boolean")> Whether the node is disabled. - `expanded` <[boolean](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Data_structures#Boolean_type "Boolean")> Whether the node is expanded or collapsed. - `focused` <[boolean](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Data_structures#Boolean_type "Boolean")> Whether the node is focused. - `modal` <[boolean](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Data_structures#Boolean_type "Boolean")> Whether the node is [modal](https://en.wikipedia.org/wiki/Modal_window). - `multiline` <[boolean](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Data_structures#Boolean_type "Boolean")> Whether the node text input supports multiline. - `multiselectable` <[boolean](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Data_structures#Boolean_type "Boolean")> Whether more than one child can be selected. - `readonly` <[boolean](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Data_structures#Boolean_type "Boolean")> Whether the node is read only. - `required` <[boolean](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Data_structures#Boolean_type "Boolean")> Whether the node is required. - `selected` <[boolean](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Data_structures#Boolean_type "Boolean")> Whether the node is selected in its parent node. - `checked` <[boolean](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Data_structures#Boolean_type "Boolean")|"mixed"> Whether the checkbox is checked, or "mixed". - `pressed` <[boolean](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Data_structures#Boolean_type "Boolean")|"mixed"> Whether the toggle button is checked, or "mixed". - `level` <[number](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Data_structures#Number_type "Number")> The level of a heading. - `valuemin` <[number](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Data_structures#Number_type "Number")> The minimum value in a node. - `valuemax` <[number](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Data_structures#Number_type "Number")> The maximum value in a node. - `autocomplete` <[string](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Data_structures#String_type "String")> What kind of autocomplete is supported by a control. - `haspopup` <[string](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Data_structures#String_type "String")> What kind of popup is currently being shown for a node. - `invalid` <[string](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Data_structures#String_type "String")> Whether and in what way this node's value is invalid. - `orientation` <[string](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Data_structures#String_type "String")> Whether the node is oriented horizontally or vertically. - `children` <[Array](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Array "Array")<[Object](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Object "Object")>> Child [AXNode](#?product=Puppeteer&version=v1.11.0&show=api-accessibilitysnapshotoptions "AXNode")s of this node, if any. Captures the current state of the accessibility tree. The returned object represents the root accessible node of the page. > **NOTE** The Chromium accessibility tree contains nodes that go unused on most platforms and by most screen readers. Puppeteer will discard them as well for an easier to process tree, unless `interestingOnly` is set to `false`. An example of dumping the entire accessibility tree: ``` const snapshot = await page.accessibility.snapshot();console.log(snapshot); ``` An example of logging the focused node's name: ``` const snapshot = await page.accessibility.snapshot();const node = findFocusedNode(snapshot);console.log(node && node.name);function findFocusedNode(node) { if (node.focused) return node; for (const child of node.children || []) { const foundNode = findFocusedNode(child); return foundNode; } return null;} ```  puppeteer.js中文网|class:accessibility puppeteer.js中文文档, puppeteer chrome, puppeteer firefox, puppeteer api 中文文档 puppeteer.js中文网包含了Puppeteer中文文档，最新资讯，应用案例等。Puppeteer 是一个 Node 库，它提供了一个高级 API 来通过 DevTools 协议控制 Chromium 或 Chrome。