feat: add modal-box and backdrop animations by mcoker · Pull Request #8584 · patternfly/patternfly

mcoker · 2026-09-08T19:50:01Z

This is to support patternfly/patternfly-react#12552
Changes needed for patternfly/patternfly-react#12552 to work with this PR are in GAUNSD/patternfly-react#1

Added a couple of examples that you need to toggle classes to see the animations.

Modal example - https://pf-pr-8584.surge.sh/components/modal/html/animated/
- toggle .pf-m-open on the modal to see the animation
Backdrop demo - https://pf-pr-8584.surge.sh/components/backdrop/html-demos/animated/
- toggle .pf-m-show on the backdrop to see the animation

FWIW I first made this update using a web standards approach with dialog, ::backdrop, and invoker commands on button, since that's the direction we should ultimately go. Here's a POC - https://codepen.io/mcoker/pen/PwpZavX?editors=1100

The approach in this PR is effectively the same, so when we want to switch to using dialog and ::backdrop, the changes should be minimal.

Summary by CodeRabbit

New Features
- Added optional fade-in and fade-out animations for Backdrop components.
- Added optional entry and exit animations for Modal Box components.
- Added controls for showing, hiding, opening, and closing animated overlays.
- Improved animated overlay transitions using visibility states for smoother behavior.
Documentation
- Added usage examples and guidance for enabling and controlling Backdrop and Modal Box animations.
- Added interactive demonstrations of basic and animated Backdrop behavior.

coderabbitai · 2026-09-08T19:56:24Z

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src/patternfly/components/Backdrop/backdrop.hbs
src/patternfly/components/Backdrop/examples/Backdrop.md
src/patternfly/demos/Backdrop/examples/Backdrop.md

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src/patternfly/components/Backdrop/examples/Backdrop.md

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Walkthrough

Backdrop and ModalBox now support animated show, hide, open, and close states. Templates emit the required modifiers, CSS defines opacity and visibility transitions, and examples document the new usage.

Changes

Modal and Backdrop animations

Layer / File(s)	Summary
Backdrop animation support `src/patternfly/components/Backdrop/backdrop.hbs`, `src/patternfly/components/Backdrop/backdrop.scss`, `src/patternfly/components/Backdrop/examples/Backdrop.md`, `src/patternfly/demos/Backdrop/examples/Backdrop.md`	The Backdrop template emits `pf-m-animate` and `pf-m-show`. CSS adds opacity and visibility transitions. Component and demo documentation add animated examples and modifier usage.
ModalBox animation support `src/patternfly/components/ModalBox/modal-box.hbs`, `src/patternfly/components/ModalBox/modal-box.scss`, `src/patternfly/components/ModalBox/examples/ModalBox.md`	The ModalBox template emits `pf-m-animate` and `pf-m-open`. CSS adds animated opacity, visibility, and translation states. Documentation adds the animated example and modifier usage.

Estimated code review effort: 3 (Moderate) | ~20 minutes

Merge Risk: 🟡 Moderate · up to f93be

Non-animated modal boxes may appear shifted by 24px for users, so the animation changes are not ready to merge until that layout regression is addressed or explicitly accepted.

🚥 Pre-merge checks | ✅ 4

✅ Passed checks (4 passed)

Check name	Status	Explanation
Linked Issues check	✅ Passed	The changes implement animations for ModalBox and Backdrop as required by issue `#8517`. They add animation states, visibility transitions, Handlebars examples, and usage documentation for `.pf-m-open` …
Out of Scope Changes check	✅ Passed	All changes support the linked objective. The stylesheet updates implement the animations, and the component examples and demo documentation document and demonstrate the new behavior.
Description Check	✅ Passed	Check skipped - CodeRabbit’s high-level summary is enabled.
Title check	✅ Passed	The title follows the Conventional Commits format with the `feat` type and clearly describes the added ModalBox and Backdrop animations.

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Actionable comments posted: 3

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Inline comments:
In `@src/patternfly/components/Backdrop/backdrop.scss`:
- Line 17: Restructure the reduced-motion override declarations to satisfy
Stylelint’s no-invalid-position-declaration rule: update the TransitionProperty
override in src/patternfly/components/Backdrop/backdrop.scss lines 17-17, and
update the TranslateY and TransitionProperty overrides in
src/patternfly/components/ModalBox/modal-box.scss lines 88-89. Preserve the
existing reduced-motion behavior while using the accepted declaration order.
- Around line 30-31: Update the .pf-m-animate hidden state to set
pointer-events: none, and ensure the .pf-m-show state restores pointer events so
the visible backdrop remains interactive.

In `@src/patternfly/components/ModalBox/modal-box.hbs`:
- Line 8: Update the modal modifier mapping in the modal-box template so the
value checked by setModifiers for modal-box--modifier is appended from that same
context value, preserving custom classes when callers set only
modal-box--modifier.

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📒 Files selected for processing (6)

src/patternfly/components/Backdrop/backdrop.hbs
src/patternfly/components/Backdrop/backdrop.scss
src/patternfly/components/Backdrop/examples/Backdrop.md
src/patternfly/components/ModalBox/examples/ModalBox.md
src/patternfly/components/ModalBox/modal-box.hbs
src/patternfly/components/ModalBox/modal-box.scss

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patternfly-build · 2026-09-08T20:03:43Z

Preview: https://pf-pr-8584.surge.sh

A11y report: https://pf-pr-8584-a11y.surge.sh

mcoker · 2026-09-08T22:55:44Z

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coderabbitai · 2026-09-08T22:55:49Z

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jcmill

Looks great to me. Just one super small nit comment that could be ignored.

jcmill · 2026-09-10T14:05:53Z

  --#{$modal-box}__footer--c-button--MarginInlineEnd: var(--pf-t--global--spacer--gap--action-to-action--default);
  --#{$modal-box}__footer--c-button--sm--MarginInlineEnd: var(--pf-t--global--spacer--gap--action-to-action--default);
+
+  // Animate top


Super nit, but both the // Animate top comments no longer apply.

andrew-ronaldson

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Inline comments:
In `@src/patternfly/components/ModalBox/modal-box.scss`:
- Around line 127-129: Move the prefers-reduced-motion translation rule into the
.pf-m-animate selector so only animated modal boxes receive the initial 24px
offset; preserve the existing .pf-m-open reset and behavior for non-animated
modal boxes.

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mcoker · 2026-09-10T18:24:31Z

@jcmill @andrew-ronaldson would you mind taking another look? I just pushed a few updates:

Hardcodes the 24px offset instead of using any vars. Andrew confirmed we don't want this offset to be tied to the --lg spacer, and we don't want it to be easily overridden.
Drops the use of transition-delay in favor of relying on transition-duration - this is for visibility on close. Instead of using transition-duration: 0s; transition-delay: [the fade/slide transition duration]; for applying visibility, we can just use transition-duration: [the fade/slide transition duration] for visibility - it does the same thing.
Switches the backdrop to animate visibility, which I should have done in the first place. Removes the need to set pointer-events.
Updates both to use --accelerate for the exit timing function like it is in the codepen. Is that preferred @andrew-ronaldson? I assumed with decelerate on entry, we would accelerate on exit.
Leaves the fade on with prefers-motion: reduce. I was disabling both the offset/slide and the opacity/fade for reduced motion and I forgot that we leave the fades on in reduced motion.
Adds a default page component behind our modal demos.

patternfly-build · 2026-09-14T18:30:23Z

🎉 This PR is included in version 6.6.0-prerelease.44 🎉

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mcoker added 2 commits September 8, 2026 14:36

feat: add modal-box and backdrop animations

f232100

chore: add examples

b7187fd

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Comment thread src/patternfly/components/Backdrop/backdrop.scss Outdated

Comment thread src/patternfly/components/Backdrop/backdrop.scss

Comment thread src/patternfly/components/ModalBox/modal-box.hbs Outdated

mcoker mentioned this pull request Sep 8, 2026

chore: updates to support new CSS GAUNSD/patternfly-react#1

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mcoker requested review from andrew-ronaldson, jcmill and thatblindgeye September 8, 2026 20:19

mcoker mentioned this pull request Sep 8, 2026

feat(Modal,Backdrop): Add animation support patternfly/patternfly-react#12552

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chore: cleanup

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patternfly deleted a comment from coderabbitai Bot Sep 8, 2026

chore: animate from bottom

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jcmill approved these changes Sep 10, 2026

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chore: updates

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Comment thread src/patternfly/components/ModalBox/modal-box.scss Outdated

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mcoker added 2 commits September 10, 2026 15:01

chore: add demos with page behind backdrop

f93be0b

chore: update

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thatblindgeye approved these changes Sep 11, 2026

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jcmill merged commit 5dbcd8d into patternfly:main Sep 14, 2026
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patternfly-build added the released on @prerelease label Sep 14, 2026

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