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馃殌 [Story performance] Disable animations in first page under experiment #35356

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merged 6 commits into from
Jul 27, 2021
Merged

馃殌 [Story performance] Disable animations in first page under experiment #35356

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b935487
Added experiment
mszylkowski Jul 22, 2021
c992fcc
Change experiment rollout percentage
mszylkowski Jul 22, 2021
67fdb9f
Add to CSI metrics
mszylkowski Jul 22, 2021
7bac348
Trigger experiment with reduced-motion
mszylkowski Jul 22, 2021
036b512
Change experiment to 10%
mszylkowski Jul 22, 2021
77b7c8b
merge branch main of amphtml into animation_reducedmotion
mszylkowski Jul 27, 2021
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1 change: 1 addition & 0 deletions build-system/global-configs/canary-config.json
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Original file line number Diff line number Diff line change
Expand Up @@ -21,5 +21,6 @@
"story-ad-auto-advance": 1,
"story-ad-placements": 1,
"story-load-first-page-only": 0.1,
"story-disable-animations-first-page": 0.05,
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"amp-story-page-attachment-ui-v2": 1
}
1 change: 1 addition & 0 deletions build-system/global-configs/prod-config.json
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Expand Up @@ -17,6 +17,7 @@
"amp-consent-granular-consent": 1,
"amp-cid-backup": 1,
"story-ad-placements": 0.01,
"story-disable-animations-first-page": 0.05,
"story-load-first-page-only": 0.1,
"amp-story-page-attachment-ui-v2": 1
}
20 changes: 14 additions & 6 deletions extensions/amp-story/1.0/animation.js
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Original file line number Diff line number Diff line change
Expand Up @@ -38,9 +38,14 @@ import {escapeCssSelectorIdent} from '#core/dom/css-selectors';
import {getChildJsonConfig} from '../../../src/json';
import {map, omit} from '#core/types/object';
import {prefersReducedMotion} from '#core/dom/media-query-props';
import {scopedQuerySelector, scopedQuerySelectorAll} from '#core/dom/query';
import {
matches,
scopedQuerySelector,
scopedQuerySelectorAll,
} from '#core/dom/query';
import {setStyles} from '#core/dom/style';
import {timeStrToMillis, unscaledClientRect} from './utils';
import {isExperimentOn} from '#experiments';

const TAG = 'AMP-STORY';

Expand Down Expand Up @@ -554,7 +559,10 @@ export class AnimationManager {
this.builderPromise_ = this.createAnimationBuilderPromise_();

/** @private @const {bool} */
this.prefersReducedMotion_ = prefersReducedMotion(ampdoc.win);
this.skipAnimations_ =
prefersReducedMotion(ampdoc.win) ||
(isExperimentOn(ampdoc.win, 'story-disable-animations-first-page') &&
matches(page, 'amp-story-page:first-of-type'));

/** @private {?Array<!AnimationRunner>} */
this.runners_ = null;
Expand All @@ -581,7 +589,7 @@ export class AnimationManager {
applyFirstFrameOrFinish() {
return Promise.all(
this.getOrCreateRunners_().map((runner) =>
this.prefersReducedMotion_
this.skipAnimations_
? runner.applyLastFrame()
: runner.applyFirstFrame()
)
Expand All @@ -600,7 +608,7 @@ export class AnimationManager {

/** Starts all entrance animations for the page. */
animateIn() {
if (this.prefersReducedMotion_) {
if (this.skipAnimations_) {
return;
}
this.getRunners_().forEach((runner) => runner.start());
Expand All @@ -622,15 +630,15 @@ export class AnimationManager {

/** Pauses all animations in the page. */
pauseAll() {
if (!this.runners_ || this.prefersReducedMotion_) {
if (!this.runners_ || this.skipAnimations_) {
return;
}
this.getRunners_().forEach((runner) => runner.pause());
}

/** Resumes all animations in the page. */
resumeAll() {
if (!this.runners_ || this.prefersReducedMotion_) {
if (!this.runners_ || this.skipAnimations_) {
return;
}
this.getRunners_().forEach((runner) => runner.resume());
Expand Down