chore: release 15.8.0 documentation (#6330)

AtofStryker · mschile · cacieprins · web-flow · commit b84dd3f178aa · 2025-12-16T16:31:50.000-05:00
* chore: add basic entry for cypress 15.8.0 * chore: add angular 21 documentation (#6326) * doc: add docs for synchronous XHR requests (#6332) * Experimental fast visibility (#6337) * initial experiment documentation * add default & fast visibility semantics, cross-reference links * add history entry to experiments page * add link to github issue for the experimental fast visibility experiment * add note that scrolling is a future enhancement/fix * edit pass * another edit pass --------- Co-authored-by: Bill Glesias <bglesias@gmail.com> * chore: add 15.8.0 changelog (#6339) --------- Co-authored-by: Matt Schile <mschile@cypress.io> Co-authored-by: Cacie Prins <cacieprins@users.noreply.github.com>
diff --git a/docs/app/component-testing/angular/api.mdx b/docs/app/component-testing/angular/api.mdx
@@ -13,6 +13,11 @@ sidebar_label: API
 
 ### mount
 
+```js
+// for Angular 20 and 21 using zoneless configuration
+import { mount } from 'cypress/angular-zoneless'
+```
+
 ```js
 import { mount } from 'cypress/angular'
 ```
@@ -142,18 +147,22 @@ providers, declarations, imports and even component @Inputs()
     <td>Description</td>
   </thead>
   <tr>
-    <td>autoSpyOutputs</td>
+    <td>autoSpyOutputs (deprecated)</td>
     <td>boolean (optional)</td>
     <td>
       flag to automatically create a cy.spy() for every component @Output()
-      property
+      property. This is deprecated and not supported in
+      `cypress/angular-zoneless` and will be removed in a future version
     </td>
   </tr>
   <tr>
-    <td>autoDetectChanges</td>
+    <td>autoDetectChanges (deprecated)</td>
     <td>boolean (optional)</td>
     <td>
-      flag defaulted to true to automatically detect changes in your components
+      flag defaulted to true to automatically detect changes in your components.
+      This is deprecated and not supported in `cypress/angular-zoneless` and
+      will be removed in a future version as it is not needed with zoneless
+      configuration
     </td>
   </tr>
   <tr>
diff --git a/docs/app/component-testing/angular/examples.mdx b/docs/app/component-testing/angular/examples.mdx
@@ -46,7 +46,6 @@ in the options:
 cy.mount(StepperComponent, {
   componentProperties: {
     count: 100,
-    change: new EventEmitter(),
   },
 })
 ```
@@ -157,6 +156,26 @@ it('clicking + fires a change event with the incremented value', () => {
 })
 ```
 
+### Working with Legacy @Input() Decorators
+
+With the release of Angular 18, [signals](https://angular.dev/guide/signals) became the preferred way to handle data binding.
+However, legacy components that use `@Input()` and `@Output()` decorators are still supported.
+
+Interacting with legacy `@Input()` decorators is a bit different than working with signals.
+In order to update the `@Input()` value, you need to use the `componentRef.setInput` method so Angular change detection runs properly.
+Otherwise, you may see errors.
+
+```ts
+cy.mount(StepperComponent, { componentProperties: { count: 100 } })
+  .then(({ fixture }) => {
+    return cy.contains('span', '100').wrap(fixture)
+  })
+  .then((fixture) => {
+    fixture.componentRef.setInput('count', 110)
+    return cy.contains('span', '110')
+  })
+```
+
 ### Using createOutputSpy()
 
 To make spying on event emitters easier, there is a utility function called
@@ -179,7 +198,13 @@ it('clicking + fires a change event with the incremented value', () => {
 })
 ```
 
-### Using autoSpyOutputs
+### Using autoSpyOutputs (deprecated)
+
+:::caution
+
+The `autoSpyOutputs` flag is deprecated and not supported in `cypress/angular-zoneless` and will be removed in a future version.
+
+:::
 
 You might find yourself repeatedly creating a `cy.spy()` for each of your
 component outputs. Because of this, we created an easy mechanism to handle this
@@ -208,17 +233,8 @@ function. It currently does not work with the template syntax.
 
 :::
 
-:::caution
-
-`autoSpyOutput` is an **experimental feature** and could be removed or changed
-in the future
-
-:::
-
 ### Signals
 
-With the releases of Angular versions [17.1](https://github.com/angular/angular/blob/main/CHANGELOG.md#1710-2024-01-17) and [17.2](https://github.com/angular/angular/blob/main/CHANGELOG.md#1720-2024-02-14), [input](https://github.com/angular/angular/pull/53521) and [model](https://github.com/angular/angular/pull/54252) signals were introduced into the `@angular/core` API. Though basic signals were introduced in Angular `16`, using all signals requires Angular `17.2` and above.
-
 :::info
 
 With Cypress 14, signal support is directly included in the `cypress/angular` testing harness.
@@ -434,7 +450,13 @@ This custom mount command will allow you to skip manually passing in the
 `ButtonComponent` and `CardComponent` as declarations into each `cy.mount()`
 call.
 
-### autoSpyOutputs
+### autoSpyOutputs (deprecated)
+
+:::caution
+
+The `autoSpyOutputs` flag is deprecated and not supported in `cypress/angular-zoneless` and will be removed in a future version.
+
+:::
 
 Here is an example of defaulting `autoSpyOutputs` for every mounted component:
 
diff --git a/docs/app/component-testing/angular/overview.mdx b/docs/app/component-testing/angular/overview.mdx
@@ -20,11 +20,12 @@ sidebar_label: Overview
 
 ## Framework Support
 
-Cypress Component Testing supports Angular `^18.0.0`, `^19.0.0`, and `^20.0.0`.
+Cypress Component Testing supports Angular `^18.0.0`, `^19.0.0`, `^20.0.0`, and `^21.0.0`.
 
 :::info
 
 Our testing harness, `cypress/angular`, still requires `zone.js` and `@angular-devkit/build-angular` to be installed in your project, even if your project is zoneless or is built with `@angular/build`.
+If you wish to use the zoneless configuration, which is the default in Angular 21, you can use `cypress/angular-zoneless` testing harness instead as of Cypress `15.8.0`.
 :::
 
 ## Tutorial
@@ -129,5 +130,5 @@ export default {
 
 #### Sample Angular Apps
 
-- [Angular 18](https://github.com/cypress-io/cypress-component-testing-apps/tree/main/angular)
 - [Angular 20 Standalone](https://github.com/cypress-io/cypress-component-testing-apps/tree/main/angular-standalone)
+- [Angular 21 Zoneless](https://github.com/cypress-io/cypress-component-testing-apps/tree/main/angular-zoneless)
diff --git a/docs/app/component-testing/get-started.mdx b/docs/app/component-testing/get-started.mdx
@@ -47,7 +47,7 @@ following development servers and frameworks:
 | [Next.js 14-16](/app/component-testing/react/overview#Nextjs)                                                      | React 18-19   | Webpack 5 |
 | [Vue with Vite](/app/component-testing/vue/overview#Vue-with-Vite)                                                 | Vue 3         | Vite 5-7  |
 | [Vue with Webpack](/app/component-testing/vue/overview#Vue-with-Webpack)                                           | Vue 3         | Webpack 5 |
-| [Angular](/app/component-testing/angular/overview#Framework-Configuration)                                         | Angular 18-20 | Webpack 5 |
+| [Angular](/app/component-testing/angular/overview#Framework-Configuration)                                         | Angular 18-21 | Webpack 5 |
 | [Svelte with Vite](/app/component-testing/svelte/overview#Svelte-with-Vite) <Badge type="info">Alpha</Badge>       | Svelte 5      | Vite 5-7  |
 | [Svelte with Webpack](/app/component-testing/svelte/overview#Svelte-with-Webpack) <Badge type="info">Alpha</Badge> | Svelte 5      | Webpack 5 |
 
diff --git a/docs/app/core-concepts/interacting-with-elements.mdx b/docs/app/core-concepts/interacting-with-elements.mdx
@@ -26,6 +26,119 @@ inform your testing strategy, and ship high-quality code with confidence.
 
 :::
 
+## Visibility
+
+### Default Behavior
+
+Cypress checks a lot of things to determine an element's visibility. The
+following calculations factor in CSS translations and transforms.
+
+#### An element is considered hidden if:
+
+- Its `width` or `height` is `0`.
+- Its CSS property (or ancestors) is `visibility: hidden`.
+- Its CSS property (or ancestors) is `display: none`.
+- Its CSS property is `position: fixed` and it's offscreen or covered up.
+- Any of its ancestors **hides overflow**\*
+  - AND that ancestor has a `width` or `height` of `0`
+  - AND an element between that ancestor and the element is `position: absolute`
+- Any of its ancestors **hides overflow**\*
+  - AND that ancestor or an ancestor between it and that ancestor is its offset
+    parent
+  - AND it is positioned outside that ancestor's bounds
+- Any of its ancestors **hides overflow**\*
+  - AND the element is `position: relative`
+  - AND it is positioned outside that ancestor's bounds
+
+\***hides overflow** means it has `overflow: hidden`, `overflow-x: hidden`,
+`overflow-y: hidden`, `overflow: scroll`, or `overflow: auto`
+
+:::info
+
+<strong>Opacity</strong>
+
+Elements where the CSS property (or ancestors) is `opacity: 0` are considered
+hidden when
+[asserting on the element's visibility directly](/app/references/assertions#Visibility).
+
+However elements where the CSS property (or ancestors) is `opacity: 0` are
+considered actionable and any commands used to interact with the hidden element
+will perform the action.
+
+:::
+
+### Experimental Fast Visibility
+
+You can enable a faster visibility detection algorithm using [`experimentalFastVisibility`](/app/references/experiments#Experimental-Fast-Visibility).
+
+This algorithm is more accurate and less resource-intensive than the default behavior, but it has slightly different semantics.
+
+When `experimentalFastVisibility` is enabled, an element is considered hidden if:
+
+- Its `width` or `height` is `0`
+- Its computed CSS properties prevent it from being clicked on or visible:
+  - `visibility: hidden`
+  - `opacity: 0`
+  - `display: none`
+  - `pointer-events: none`
+- It is positioned fully outside of the browser viewport
+  - _this is a known compatibility issue with the legacy visibility algorithm_ when it comes to asserting visibility. It will be addressed during the course of this experiment.
+- It is fully covered or clipped by another element
+
+Keep up-to-date with the the progress of this experiment in the [Cypress repository](https://github.com/cypress-io/cypress/issues/33043).
+
+#### Limitations
+
+Experimental fast visibility is an experimental feature that is still under development. It uses different semantics from the legacy visibility algorithm, and does not yet fully support all testing scenarios.
+
+- Shadow DOM is not yet supported. Tests that interact with Shadow DOM elements may fail or behave incorrectly.
+- Elements outside of the browser's viewport are not yet correctly identified as visible. Scroll elements into view before testing.
+
+#### Common Compatibility Issues
+
+When enabling fast visibility, you may encounter differences in how elements are detected. The fast algorithm provides more geometrically accurate visibility detection, which may reveal that elements previously considered visible are actually hidden.
+
+**Elements Outside Viewport**
+
+Elements positioned outside the viewport are now correctly identified as hidden. Scroll elements into view before testing:
+
+```javascript
+// Before
+cy.get('.off-screen-element').should('be.visible')
+
+// After
+cy.get('.off-screen-element').scrollIntoView().should('be.visible')
+```
+
+**Covered Elements**
+
+Elements covered by other elements are now correctly identified as hidden. Test the covering element or the user interaction that reveals the covered element:
+
+```javascript
+// Test the user action that reveals the element
+cy.get('.toggle-button').click()
+cy.get('.covered-element').should('be.visible')
+```
+
+**Zero-Dimension Containers**
+
+Containers with zero dimensions are now correctly identified as hidden. Test the child element instead of the container:
+
+```javascript
+// Test the child element that should be visible
+cy.get('.zero-dimension-container .child-element').should('be.visible')
+```
+
+**Elements with `pointer-events: none`**
+
+Elements with `pointer-events: none` may be detected as hidden when they are visible. Do not assert visibility on elements with `pointer-events: none`, as they cannot be interacted with.
+
+:::caution
+
+**Important:** If tests fail after enabling fast visibility, the fast algorithm is likely correct and tests should be updated to match the actual behavior.
+
+:::
+
 ## Actionability
 
 Some commands in Cypress are for interacting with the DOM such as:
@@ -71,45 +184,6 @@ Whenever Cypress cannot interact with an element, it could fail at any of the
 above steps. You will usually get an error explaining why the element was not
 found to be actionable.
 
-### Visibility
-
-Cypress checks a lot of things to determine an element's visibility. The
-following calculations factor in CSS translations and transforms.
-
-#### An element is considered hidden if:
-
-- Its `width` or `height` is `0`.
-- Its CSS property (or ancestors) is `visibility: hidden`.
-- Its CSS property (or ancestors) is `display: none`.
-- Its CSS property is `position: fixed` and it's offscreen or covered up.
-- Any of its ancestors **hides overflow**\*
-  - AND that ancestor has a `width` or `height` of `0`
-  - AND an element between that ancestor and the element is `position: absolute`
-- Any of its ancestors **hides overflow**\*
-  - AND that ancestor or an ancestor between it and that ancestor is its offset
-    parent
-  - AND it is positioned outside that ancestor's bounds
-- Any of its ancestors **hides overflow**\*
-  - AND the element is `position: relative`
-  - AND it is positioned outside that ancestor's bounds
-
-\***hides overflow** means it has `overflow: hidden`, `overflow-x: hidden`,
-`overflow-y: hidden`, `overflow: scroll`, or `overflow: auto`
-
-:::info
-
-<strong>Opacity</strong>
-
-Elements where the CSS property (or ancestors) is `opacity: 0` are considered
-hidden when
-[asserting on the element's visibility directly](/app/references/assertions#Visibility).
-
-However elements where the CSS property (or ancestors) is `opacity: 0` are
-considered actionable and any commands used to interact with the hidden element
-will perform the action.
-
-:::
-
 ### Disability
 
 Cypress checks whether the `disabled` property is `true` on a
diff --git a/docs/app/references/assertions.mdx b/docs/app/references/assertions.mdx
@@ -258,6 +258,14 @@ Watch the short video
 ["Multiple elements and should('be.visible') assertion"](https://www.youtube.com/watch?v=LxkrhUEE2Qk)
 that shows how to correctly check the visibility of elements.
 
+:::info
+
+**Visibility Semantics**
+
+For detailed information about how Cypress determines element visibility, including the default behavior and the experimental fast visibility algorithm, see [Visibility](/app/core-concepts/interacting-with-elements#Visibility).
+
+:::
+
 ### Existence
 
 ```javascript
diff --git a/docs/app/references/changelog.mdx b/docs/app/references/changelog.mdx
@@ -8,6 +8,34 @@ sidebar_label: Changelog
 
 # Changelog
 
+## 15.8.0
+
+_Released 12/16/2025_
+
+**Performance:**
+
+- Introduced a new `experimentalFastVisibility` experiment. Enabling this experiment changes how Cypress performs visibility checks and assertions. Read more about [experimental fast visibility](/app/references/experiments#Experimental-Fast-Visibility). Addresses [#33044](https://github.com/cypress-io/cypress/issues/33044). Addressed in [#32801](https://github.com/cypress-io/cypress/pull/32801).
+
+**Features:**
+
+- `Angular` version 21 is now supported within component testing. Addressed in [#33004](https://github.com/cypress-io/cypress/pull/33004).
+- Adds zoneless support for `Angular` Component Testing through the `angular-zoneless` mount function. Addresses [#31504](https://github.com/cypress-io/cypress/issues/31504) and [#30070](https://github.com/cypress-io/cypress/issues/30070).
+- After receiving feedback on its usefulness outside of Studio, the Selector Playground is now available for all users in open mode. When opened, the playground automatically enables interactive mode to help you build and test selectors directly in your application. Addresses [#32672](https://github.com/cypress-io/cypress/issues/32672). Addressed in [#33073](https://github.com/cypress-io/cypress/pull/33073).
+
+**Bugfixes:**
+
+- Fixed an issue where a EPIPE error shows up after CTRL+C is done in terminal. Fixes [#30659](https://github.com/cypress-io/cypress/issues/30659). Addressed in [#32873](https://github.com/cypress-io/cypress/pull/32873).
+- Fixed an issue where the browser would freeze when Cypress intercepts a synchronous XHR request and a `routeHandler` is used. Fixes [#32874](https://github.com/cypress-io/cypress/issues/32874). Addressed in [#32925](https://github.com/cypress-io/cypress/pull/32925).
+- Fixed an issue where `Next.js` Component Testing would not load correctly without a TypeScript-based Next config in versions 16.0.3 and up. Fixes [#32968](https://github.com/cypress-io/cypress/issues/32968).
+- Fixed an issue where the error message for `not.have.length` was not correctly displaying the expected length in the Command Log. Addressed in [#18927](https://github.com/cypress-io/cypress/issues/18927).
+- Fixed an issue where `removeAttribute()` would not work for attributes other than `target` on anchor or form elements after clicking links with `target="_top"` or `target="_parent"`. Fixes [#26206](https://github.com/cypress-io/cypress/issues/26206). Addressed in [#33051](https://github.com/cypress-io/cypress/pull/33051).
+
+**Dependency Updates:**
+
+- Removed extraneous dependencies that are no longer used. Addressed in [#33098](https://github.com/cypress-io/cypress/pull/33098).
+- Upgraded `brace-expansion`. This removes the [CVE-2025-5889](https://security.snyk.io/vuln/SNYK-JS-BRACEEXPANSION-9789073) vulnerability being reported in security scans. Addressed in [#33112](https://github.com/cypress-io/cypress/pull/33112).
+- Upgraded `form-data`. This removes the [CVE-2025-7783](https://security.snyk.io/vuln/SNYK-JS-FORMDATA-10841150) vulnerability being reported in security scans. Addressed in [#33113](https://github.com/cypress-io/cypress/pull/33113).
+
 ## 15.7.1
 
 _Released 12/02/2025_
diff --git a/docs/app/references/error-messages.mdx b/docs/app/references/error-messages.mdx
diff --git a/docs/app/references/experiments.mdx b/docs/app/references/experiments.mdx
