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CSS

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HTML 

              
                .page

    .views
        - for(var i = 0; i < 15; i++)
            .view.view--1
                .view__inner
                    h2(style="font-size: 100px") #{2000 + i}

    .timeline__wrapper
        .timeline
            a.timeline__all-cars(href="#") All cars
            ul.timeline__list
                - for(var i = 0; i < 15; i++)
                    - var className = 'timeline__item'
                    - if(i == 0)
                        - className = className + ' timeline__item--active'
                        
                    li(class= className)
                        a.timeline__link(href="#")
                            .timeline__item__point
                        .timeline__item__content
                            img.timeline__item__thumb(src="http://testuje.cz/timeline-car-thumbnail.png")
                            .timeline__item__shadow
                        .timeline__item__year #{2000 + i}

            a.timeline__exit(href="#") Exit
            .timeline__path
                .timeline__path__triangle.timeline__path__triangle--moving
                .timeline__path__triangle.timeline__path__triangle--static-1
                .timeline__path__triangle.timeline__path__triangle--static-2
                .timeline__path__triangle.timeline__path__triangle--static-3
!

CSS 

              
                /// Remove the unit of a length
/// @param {Number} $number - Number to remove unit from
/// @return {Number} - Unitless number
@function strip-unit($number)
    @if type-of($number) == 'number' and not unitless($number)
        @return $number / ($number * 0 + 1)

    @return $number

$timelinePointSize: 5px
$timelineBubbleSize: 130px
$timelineBubbleSizeNoUnits: strip-unit($timelineBubbleSize)
$timelineBubbleWidth: 90px
$timelineHeight: 130px
$timelineTriangleSize: $timelineBubbleSize*2

html, body
    height: 100%
    
body
    background: #dedede
    display: flex
    overflow: hidden
    
.page
    flex: 1
    display: flex
    justify-content: flex-end
    flex-direction: column

.timeline__wrapper
    padding: 0 30px
    height: $timelineHeight
    display: flex
    
.timeline
    display: flex
    flex: 1
    align-items: center
    position: relative
    
    a
        text-decoration: none
        &:hover
            text-decoration: underline
    
.timeline__all-cars,
.timeline__exit
    // flex: none
    padding: 1em 1.75em
    display: inline-block
    background: white
    
.timeline__list
    flex: 1
    display: flex
    list-style-type: none
    margin: 0 30px
    padding: 0
    justify-content: space-between
    align-items: center
    align-self: stretch
    position: relative

.timeline__item
    flex: 1
    position: relative
    border: 1px dashed rgba(black, .1)
    
    &:after
        content: ''
        width: calc(100% - #{$timelinePointSize}*3)
        height: 1px
        position: absolute
        top: 50%
        left: calc(50% + #{$timelinePointSize} - 1px)
        background: white
        z-index: 5
        pointer-events: none

    &:last-child:after
        display: none

.timeline__item--active
    .timeline__item__point
        &:after
            opacity: 1
            transform: scale(1)
        
.timeline__link
    position: relative
    display: block
    padding: 10px 0
    
.timeline__item__point
    width: $timelinePointSize
    height: $timelinePointSize
    position: absolute
    top: 50%
    left: 50%
    transform: translate(-50%, -50%) rotate(45deg)
    border: 1px solid white
    z-index: 6
    
    &:after
        content: ''
        display: block
        width: 100%
        height: 100%
        background: white
        position: absolute
        top: 0
        left: 0
        transform-origin: 50% 50%
        opacity: 0
        transform: scale(0)
        transition: all .5s

.timeline__item__content
    // width: 90px
    width: $timelineBubbleSize
    height: $timelineBubbleSize
    // padding: 30px 0
    position: absolute
    left: 50%
    bottom: 100%
    transform: translate(-50%, -20px)
    opacity: 0
    transition: all .75s ease-out
    text-align: center
    // border: 1px dashed rgba(black, .25)
    display: flex
    justify-content: center
    align-items: center
    pointer-events: none
    
    // clip-path: polygon(50% -25px, calc(100% + 25px) 50%, 50% calc(100% + 25px), -25px 50%)
    
    &:before,
    &:after
        pointer-events: none
        content: ''

        border: solid $timelineBubbleWidth transparent
        position: absolute
        width: 0
        height: 0
        top: 50%
        left: 50%
        transition: all .45s ease-out
        opacity: .75
    
    &:before
        border-bottom-color: #e6e6e6
        // transform: translate(-50%, -100%)
        transform: translate(-50%, -100%) scale(.6)
        transform-origin: 50% 100%
    
    &:after
        border-top-color: white
        // transform: translate(-50%, 0%)
        transform: translate(-50%, 0%) scale(.8)
        transform-origin: 50% 0%
    
        .clippath &
            box-shadow: 0 -2px 5px 0 rgba(0,0,0,.1)
            clip-path: polygon(-2px -2px, calc(100% + 2px) -2px, 50% 100%)

    //     &:before
    //         content: ''
    //         display: block
    //         padding-bottom: 100%
    //         background: white
    //         transform-origin: 50% 50%
    //         transform: rotate(25deg)
    //         transition: transform .75s ease-out
    //         position: absolute
    //         bottom: 0
    //         left: 0
    //         width: 100%

    //     &:after
    //         content: ''
    //         display: block
    //         padding-bottom: 100%
    //         height: 0
    
    .timeline__item--active &,
    .timeline__link:hover + &
        opacity: 1
        transform: translate(-50%, -55px)
        
        &:before
            transform: translate(-50%, -100%) scale(1)
            opacity: 1

        &:after
            transform: translate(-50%, 0%) scale(1)
            opacity: 1
        
        // &:before
        //     transform: rotate(45deg)

.timeline__item__year
    position: absolute
    top: 40px
    left: 50%
    transform: translate(-50%, -50%)
    z-index: 2
    transition: all .4s ease-in
    opacity: 0
    
    .timeline__item--active &,
    .timeline__link:hover ~ &
        color: green
        font-size: 26px
        font-weight: bold
        
    .timeline__item:nth-child(3n + 1) &
        opacity: 1
    
.timeline__item__thumb
    // display: none
    position: relative
    z-index: 5
    
.timeline__item__shadow
    position: absolute
    // width: 100%
    // height: 100%
    top: calc(50% - 20/#{$timelineBubbleSizeNoUnits} * 100%)
    left: 50%
    z-index: -1
    
    width: 0
    height: 0
    border-style: solid
    border-width: $timelineBubbleSize $timelineBubbleSize 0 0
    border-color: rgba(black, .25) transparent transparent transparent
    
    transform-origin: 0 0
    transform: scale(.5)
    opacity: 0.6
    transition: all .3s
    transition-delay: .15s

    .timeline__item--active &,
    .timeline__link:hover + .timeline__item__content &
        transform: scale(1)
        opacity: 1
        


.timeline__path
    position: absolute
    top: 0
    left: 25px
    right: -30px
    height: 100%
    overflow: hidden
    pointer-events: none
    z-index: -1
    background: rgba(black, .2) url(http://testuje.cz/noise.png) repeat 0 0
    clip-path: polygon($timelineHeight 0, 100% 0, 100% 100%, 0 100%)
    
.timeline__path__triangle
    display: block
    position: absolute
    border-style: solid
    width: 0
    height: 0
    backface-visibility: hidden
    
.timeline__path__triangle--static-1,
.timeline__path__triangle--static-2
    top: 0   
        
.timeline__path__triangle--static-1
    border-width: $timelineTriangleSize $timelineTriangleSize 0 $timelineTriangleSize
    border-color: rgba(black, .2) transparent transparent transparent
    left: 0
    
.timeline__path__triangle--static-2
    border-width: $timelineTriangleSize $timelineTriangleSize 0 $timelineTriangleSize
    border-color: rgba(white, .4) transparent transparent transparent
    right: 0
    
.timeline__path__triangle--static-3
    border-width: 0 $timelineTriangleSize $timelineTriangleSize $timelineTriangleSize
    border-color: transparent transparent rgba(white, .4) transparent
    left: 30%
    bottom: 0
        
.timeline__path__triangle--moving
    position: absolute
    border-width: $timelineTriangleSize $timelineTriangleSize 0 $timelineTriangleSize
    border-color: rgba(white, .2) transparent transparent transparent
    left: 0
    top: 0
    transition: transform 3s ease-out
    
////
// ADDED
////

.views,
.view
    width: 100vw
    height: 100vh

.views    
    background: pink

.view__inner
    display: flex
    width: 100%
    height: 100%
    align-items: center
    justify-content: center
    
.timeline__wrapper
    position: absolute
    bottom: 0
    z-index: 2
    width: calc(100% - 60px)

.slick-slide
    outline: none
    
    
.slick-arrow
    background: red
    z-index: 10
    
.slick-prev
    left: 15px
    
.slick-next
    right: 15px
!

JS 

              
                let areClipPathShapesSupported = function () {

    let base = 'clipPath',
        prefixes = [ 'webkit', 'moz', 'ms', 'o' ],
        properties = [ base ],
        testElement = document.createElement( 'testelement' ),
        attribute = 'polygon(50% 0%, 0% 100%, 100% 100%)';

    // Push the prefixed properties into the array of properties.
    for ( let i = 0, l = prefixes.length; i < l; i++ ) {
        let prefixedProperty = prefixes[i] + base.charAt( 0 ).toUpperCase() + base.slice( 1 ); // remember to capitalize!
        properties.push( prefixedProperty );
    }

    // Interate over the properties and see if they pass two tests.
    for ( let i = 0, l = properties.length; i < l; i++ ) {
        let property = properties[i];

        // First, they need to even support clip-path (IE <= 11 does not)...
        if ( testElement.style[property] === '' ) {

            // Second, we need to see what happens when we try to create a CSS shape...
            testElement.style[property] = attribute;
            if ( testElement.style[property] !== '' ) {
                return true;
            }
        }
    }

    return false;
};

$(() => {
    let defaultSlickSpeed = 300;
    
    $('.views')
        .slick({
            speed: defaultSlickSpeed
        })
        .on('beforeChange', (evt, slick, currentSlide, nextSlide) => {
            let delta = Math.abs(currentSlide - nextSlide);
            if(delta === slick.slideCount - 1) {
                delta = 1;
            }
            $('.views').slick('slickSetOption', 'speed', delta * defaultSlickSpeed);
        })
        .on('afterChange', (evt, slick, currentSlide) => {
            $('.views').slick('slickSetOption', 'speed', defaultSlickSpeed);
        
            $('.timeline__list').find('.timeline__item--active').removeClass('timeline__item--active');
            $('.timeline__list').find(`.timeline__item:nth-child(${currentSlide + 1})`).addClass('timeline__item--active');
        });
    
    $('.timeline__link').on('click', (evt) => {
        evt.preventDefault();
        $('.timeline__item--active').removeClass('timeline__item--active');
        $(evt.currentTarget).parent().addClass('timeline__item--active');
        
        $('.views').slick('slickGoTo', $(evt.currentTarget).parent().prevAll('li').length);
        
    });
    
    let timelineOffset = $('.timeline').offset().left;
    let triangleWidth = $('.timeline__path__triangle--moving').outerWidth();
    
    $('.timeline').on('mousemove', (evt) => {
        let value = evt.pageX - timelineOffset - triangleWidth / 2
        $('.timeline__path__triangle--moving').css({
            transform: `translateX(${value}px)`,
        })
    });
    
    if(!areClipPathShapesSupported()) {
        $('body').addClass('no-clippath');
    } else {
        $('body').addClass('clippath');
    }
   
})
!
999px

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