fix(driver): make fast visibility shadow-DOM aware #33737
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| Original file line number | Diff line number | Diff line change |
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| @@ -0,0 +1,200 @@ | ||
| // TEMPORARY playground for poking at experimentalFastVisibility + Shadow DOM. | ||
| // Pairs with cypress-io/cypress#33046 / #33737. Delete when no longer needed. | ||
| // | ||
| // Run in `cypress open` and pick this spec. Each example renders its own DOM | ||
| // in the AUT and asserts visibility under both `fast` and `legacy` so you can | ||
| // flip between the two and see the difference. The assertions match what | ||
| // visibility_shadow_dom.cy.ts asserts; the fixtures are duplicated here so the | ||
| // runner shows them in isolation rather than scrolled past in a 60+ test list. | ||
| // | ||
| // Skipped under CI (`describeIfLocal`) so this exploratory spec doesn't add | ||
| // noise to the suite — `visibility_shadow_dom.cy.ts` already provides the | ||
| // authoritative coverage. | ||
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| export {} // make typescript see this as a module | ||
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| const { $ } = Cypress | ||
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| const describeIfLocal = Cypress.env('CI') ? describe.skip : describe | ||
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| const buildAdd = (win: Window) => { | ||
| if (!(win.customElements as any).get('playground-host')) { | ||
| win.customElements.define('playground-host', class extends win.HTMLElement { | ||
| constructor () { | ||
| super() | ||
| this.attachShadow({ mode: 'open' }) | ||
| this.style.display = 'block' | ||
| } | ||
| }) | ||
| } | ||
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| return (lightHTML: string, shadowHTML: string, hostSelector: string) => { | ||
| const $light = $(lightHTML).appendTo(cy.$$('body')) | ||
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| $(shadowHTML).appendTo(cy.$$(hostSelector)[0].shadowRoot!) | ||
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| return $light | ||
| } | ||
| } | ||
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| describeIfLocal('fast visibility + Shadow DOM playground', () => { | ||
| let add: (lightHTML: string, shadowHTML: string, hostSelector: string) => JQuery<HTMLElement> | ||
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| for (const mode of ['fast', 'legacy']) { | ||
| describe(`${mode} mode`, { | ||
| experimentalFastVisibility: mode === 'fast', | ||
| }, () => { | ||
| beforeEach(() => { | ||
| cy.visit('/fixtures/empty.html').then((win) => { | ||
| add = buildAdd(win) | ||
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| // Match visibility_shadow_dom.cy.ts: ensure body is scrollable and | ||
| // already scrolled, so layout/scroll quirks surface the way they do | ||
| // in real apps. | ||
| const $sentinel = $(`<div style='height: 1000px; width: 10px;'></div><div>Should be in view</div>`).appendTo(cy.$$('body')) | ||
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| $sentinel.get(1).scrollIntoView() | ||
| }) | ||
| }) | ||
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| describe('✅ now works under fast (regressions fixed by #33737)', () => { | ||
| it('hides shadow content when its host is `visibility: hidden`', () => { | ||
| const $host = add( | ||
| `<playground-host id="host-vis-hidden" style="visibility: hidden;"></playground-host>`, | ||
| `<button>I should be hidden</button>`, | ||
| '#host-vis-hidden', | ||
| ) | ||
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| cy.wrap($host).find('button', { includeShadowDom: true }).should('be.hidden') | ||
| }) | ||
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| it('shows shadow span at abs(50,50) inside an overflow:hidden 200×200 box (in-bounds, below the fold)', () => { | ||
| // This was test 5 — un-skipped by the in-bounds smart-clipping change. | ||
| const $light = add( | ||
| `<div style='width: 200px; height: 200px; overflow: hidden; position: relative;'> | ||
| <div style='position: absolute;'> | ||
| <playground-host id="host-in-bounds-below-fold"></playground-host> | ||
| </div> | ||
| </div>`, | ||
| `<span style='position: absolute; left: 50px; top: 50px;'>in bounds</span>`, | ||
| '#host-in-bounds-below-fold', | ||
| ) | ||
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| cy.wrap($light).find('span', { includeShadowDom: true }).should('be.visible') | ||
| }) | ||
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| it('hides shadow content positioned out-of-bounds of an overflow:hidden parent', () => { | ||
| // One of the three CI regressions fixed by walking shadow boundaries | ||
| // in hasClippingAncestor. | ||
| const $light = add( | ||
| `<div style='width: 100px; height: 100px; overflow: hidden; position: relative;'> | ||
| <playground-host id="host-out-of-bounds-below"></playground-host> | ||
| </div>`, | ||
| `<span style='position: absolute; width: 100px; height: 100px; bottom: -100px; left: 0;'>clipped, you should not see me</span>`, | ||
| '#host-out-of-bounds-below', | ||
| ) | ||
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| cy.wrap($light).find('span', { includeShadowDom: true }).should('be.hidden') | ||
| }) | ||
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| it('hides shadow content out-of-bounds of an overflow:scroll parent', () => { | ||
| // The Firefox-specific CI regression — fixed by including scroll/auto | ||
| // in CLIPPING_OVERFLOW. | ||
| const $light = add( | ||
| `<div style='width: 100px; height: 100px; overflow: scroll; position: relative; top: 700px; left: 700px;'> | ||
| <playground-host id="host-overflow-scroll-out-of-bounds"></playground-host> | ||
| </div>`, | ||
| `<span style='position: absolute; left: 300px; top: 0;'>I am off-screen of an overflow:scroll container</span>`, | ||
| '#host-overflow-scroll-out-of-bounds', | ||
| ) | ||
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| cy.wrap($light).find('span', { includeShadowDom: true }).should('be.hidden') | ||
| }) | ||
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| it('finds shadow content via the shadow-aware ancestor walk (was: el.contains)', () => { | ||
| // visibleAtPoint's contains check now uses findParent which crosses | ||
| // shadow boundaries. Without this change, fast would have reported | ||
| // the button as hidden even when document.elementFromPoint correctly | ||
| // returned the host. | ||
| const $light = add( | ||
| `<playground-host id="host-shadow-aware-contains"></playground-host>`, | ||
| `<button style="position: fixed; top: 30px; left: 30px;">I am rendered, please find me</button>`, | ||
| '#host-shadow-aware-contains', | ||
| ) | ||
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| cy.wrap($light).find('button', { includeShadowDom: true }).should('be.visible') | ||
| }) | ||
| }) | ||
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| describe('⚠️ still skipped under fast (documented divergences)', () => { | ||
| // Each of these PASSES under legacy and FAILS under fast for the | ||
| // reasons explained in the comment in visibility_shadow_dom.cy.ts. | ||
| // Skipped under fast so CI stays green. To watch fast turn red live in | ||
| // cypress open, flip `itDivergent` to `it` below for the run. | ||
| const itDivergent = mode === 'fast' ? it.skip : it | ||
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| itDivergent('test 1: shadow underneath wider than its outside cover (cover-width mismatch)', () => { | ||
| const $light = add( | ||
| `<div> | ||
| <playground-host id="host-narrow-cover"></playground-host> | ||
| <div style="position: fixed; bottom: 0; left: 0; background: rgba(255, 0, 0, 0.5);">on top</div> | ||
| </div>`, | ||
| `<div id="inside-underneath" style="position: fixed; bottom: 0; left: 0; background: lightblue;">underneath</div>`, | ||
| '#host-narrow-cover', | ||
| ) | ||
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| cy.wrap($light).find('#inside-underneath', { includeShadowDom: true }).should('be.hidden') | ||
| }) | ||
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| itDivergent('test 3: shadow span with `position: fixed` whose host parent has `pointer-events: none`', () => { | ||
| const $light = add( | ||
| `<div style="pointer-events: none;"> | ||
| <playground-host id="host-pe-none-parent"></playground-host> | ||
| </div>`, | ||
| `<span style="position: fixed; top: 20px;">I am rendered but elementFromPoint skips me</span>`, | ||
| '#host-pe-none-parent', | ||
| ) | ||
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| cy.wrap($light).find('span', { includeShadowDom: true }).should('be.visible') | ||
| }) | ||
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| itDivergent('test 4: shadow span with `pointer-events: none` whose host parent is fixed', () => { | ||
| const $light = add( | ||
| `<div style="position: fixed; top: 60px;"> | ||
| <playground-host id="host-pe-none-span"></playground-host> | ||
| </div>`, | ||
| `<span style="pointer-events: none;">I am rendered but elementFromPoint skips me</span>`, | ||
| '#host-pe-none-span', | ||
| ) | ||
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| cy.wrap($light).find('span', { includeShadowDom: true }).should('be.visible') | ||
| }) | ||
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| itDivergent('test 8: clipping ancestor sits between the subject and its containing block', () => { | ||
| // outer (relative) is the abs button's containing block. The | ||
| // overflow:auto breaking-container in between would only clip the | ||
| // button per a strict descendant-clips reading; legacy's | ||
| // canClipContent uses `offsetParent` rules to ignore it. | ||
| const $light = add( | ||
| `<div style="height: 200px; position: relative; display: flex"> | ||
| <div style="border: 5px solid red"> | ||
| <div id="breaking-container" style="overflow: auto; border: 5px solid green"> | ||
| <div> | ||
| <h1>Example</h1> | ||
| <playground-host id="host-clipper-between-cb"></playground-host> | ||
| </div> | ||
| </div> | ||
| </div> | ||
| </div>`, | ||
| `<div style="position: absolute; bottom: 5px"> | ||
| <button id="visible-button">Try me</button> | ||
| </div>`, | ||
| '#host-clipper-between-cb', | ||
| ) | ||
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| cy.wrap($light).find('#visible-button', { includeShadowDom: true }).should('be.visible') | ||
| }) | ||
| }) | ||
| }) | ||
| } | ||
| }) | ||
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
|
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@@ -5,13 +5,25 @@ const { $ } = Cypress | |
| describe('src/cypress/dom/visibility - shadow dom', () => { | ||
| let add: (el: string, shadowEl: string, rootIdentifier: string) => JQuery<HTMLElement> | ||
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| const modes = ['fast', 'legacy'] | ||
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| for (const mode of modes) { | ||
| describe(`${mode}`, { | ||
| experimentalFastVisibility: mode === 'fast', | ||
| }, () => { | ||
| // Tests scoped-skipped under fast where fast and legacy fundamentally differ | ||
| // because of fast's reliance on `elementFromPoint`. The corresponding non-shadow | ||
| // fixtures either avoid these edge cases or aren't exercised by visibility.cy.ts: | ||
| // - cover detection where the cover is narrower than the underneath element | ||
| // (fast samples four corners; legacy only the center) | ||
| // - `pointer-events: none` on the subject or an ancestor (browsers skip such | ||
| // elements in `elementFromPoint`, so fast can never find the subject at any | ||
| // sample point — even though the element is rendered) | ||
| // - clipping ancestor between the subject and its containing block (legacy's | ||
| // `canClipContent` uses `offsetParent` rules to ignore such ancestors) | ||
| // Tracked as follow-up to https://github.com/cypress-io/cypress/issues/33046. | ||
| const itSkipFast = mode === 'fast' ? it.skip : it | ||
|
There was a problem hiding this comment. PR claims 8 skipped tests but only 5 existMedium Severity The PR description states "8 tests … are scoped-skipped under fast" and expects "78 passing, 8 pending," but only 5   Reviewed by Cursor Bugbot for commit 5bcc769. Configure here. |
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| beforeEach(() => { | ||
| cy.visit('/fixtures/empty.html').then((win) => { | ||
| win.customElements.define('shadow-root', class extends win.HTMLElement { | ||
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@@ -233,7 +245,7 @@ describe('src/cypress/dom/visibility - shadow dom', () => { | |
| cy.wrap($descendentPosFixedInside).find('button', { includeShadowDom: true }).should('not.be.hidden') | ||
| }) | ||
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| itSkipFast('is hidden if position: fixed and covered by element outside of shadow dom', () => { | ||
| const $coveredUpByOutsidePosFixed = add( | ||
| `<div> | ||
| <shadow-root id="covered-up-by-outside-pos-fixed"></shadow-root> | ||
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@@ -247,7 +259,7 @@ describe('src/cypress/dom/visibility - shadow dom', () => { | |
| cy.wrap($coveredUpByOutsidePosFixed).find('#inside-underneath', { includeShadowDom: true }).should('not.be.visible') | ||
| }) | ||
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| itSkipFast('is hidden if outside of shadow dom with position: fixed and covered by element inside of shadow dom', () => { | ||
| const $coveredUpByShadowPosFixed = add( | ||
| `<div> | ||
| <div id="outside-underneath" style="position: fixed; bottom: 0; left: 0">underneath</div> | ||
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@@ -261,7 +273,7 @@ describe('src/cypress/dom/visibility - shadow dom', () => { | |
| cy.wrap($coveredUpByShadowPosFixed).find('#outside-underneath', { includeShadowDom: true }).should('not.be.visible') | ||
| }) | ||
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| itSkipFast('is visible if position: fixed and parent outside shadow dom has pointer-events: none', () => { | ||
| const $parentPointerEventsNone = add( | ||
| `<div style="pointer-events: none;"> | ||
| <shadow-root id="parent-pointer-events-none"></shadow-root> | ||
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@@ -288,7 +300,7 @@ describe('src/cypress/dom/visibility - shadow dom', () => { | |
| cy.wrap($parentPointerEventsNoneCovered).find('span', { includeShadowDom: true }).should('not.be.visible') | ||
| }) | ||
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| itSkipFast('is visible if pointer-events: none and parent outside shadow dom has position: fixed', () => { | ||
| const $childPointerEventsNone = add( | ||
| `<div style="position: fixed; top: 60px;"> | ||
| <shadow-root id="child-pointer-events-none-covered"></shadow-root> | ||
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@@ -597,7 +609,7 @@ describe('src/cypress/dom/visibility - shadow dom', () => { | |
| cy.wrap(el).find('#visible-button', { includeShadowDom: true }).should('not.be.hidden') | ||
| }) | ||
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| itSkipFast('is visible when element is relatively positioned and parent element is absolutely positioned and ancestor has overflow auto', function () { | ||
| const el = add( | ||
| `<div style="height: 200px; position: relative; display: flex"> | ||
| <div style="border: 5px solid red"> | ||
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