export class CssKeyframesDriver implements AnimationDriver {

private _count = 0;

private readonly _head: any = document.querySelector('head');

private _warningIssued = false;

validateStyleProperty(prop: string): boolean {

return validateStyleProperty(prop);

animate(

element: any, keyframes: ɵStyleData[], duration: number, delay: number, easing: string,

previousPlayers: AnimationPlayer[] = [], scrubberAccessRequested?: boolean): AnimationPlayer {

if (scrubberAccessRequested) {

this._notifyFaultyScrubber();

if ((typeof ngDevMode === 'undefined' || ngDevMode) && scrubberAccessRequested) {

notifyFaultyScrubber();

}

const previousCssKeyframePlayers = <CssKeyframesPlayer[]>previousPlayers.filter(

player.onDestroy(() => removeElement(kfElm));

return player;

}

private _notifyFaultyScrubber() {

if (!this._warningIssued) {

console.warn(

'@angular/animations: please load the web-animations.js polyfill to allow programmatic access...\n',

' visit https://bit.ly/IWukam to learn more about using the web-animation-js polyfill.');

this._warningIssued = true;

}

}

}

function flattenKeyframesIntoStyles(keyframes: null|{[key: string]: any}|

function removeElement(node: any) {

node.parentNode.removeChild(node);

}

let warningIssued = false;

function notifyFaultyScrubber(): void {

if (warningIssued) return;

console.warn(

'@angular/animations: please load the web-animations.js polyfill to allow programmatic access...\n',

' visit https://bit.ly/IWukam to learn more about using the web-animation-js polyfill.');

warningIssued = true;

}