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Here you can Sed posuere consectetur est at lobortis. Donec ullamcorper nulla non metus auctor fringilla. Maecenas sed diam eget risus varius blandit sit amet non magna. Donec id elit non mi porta gravida at eget metus. Praesent commodo cursus magna, vel scelerisque nisl consectetur et.

HTML

              
                <div id="map"></div>
<div id="effects">
  <h1>Helsinki <span id="current-time"></span></h1>
</div>
<div id="lines">
  <div class="line"></div>
  <div class="line"></div>
  <div class="line"></div>
  <div class="line"></div>
  <div class="line"></div>
  <div class="line"></div>
  <div class="line"></div>
  <div class="line"></div>
  <div class="line"></div>
  <div class="line"></div>
</div>
              
            
!

CSS

              
                html, body {
  width: 100%;
  height: 100%;
  margin: 0;
  padding: 0;
  overflow: hidden;
}

body {
  position: relative;
  perspective: 500px;
  perspective-origin: center center;
}
#map, #effects, #lines {
  position: absolute;
  left: 0;
  top: 0;
  width: 100%;
  height: 100%;
}
#map svg {
  z-index: -1;
}
#effects {
  z-index: 1000;
  pointer-events: none;
  transform-style: preserve-3d;
}
#lines {
  z-index: 1001;
  pointer-events: none;
  display: flex;
  flex-direction: column;
}
#lines .line {
  flex: 1;
  border-top: 1px solid rgba(255, 255, 255, 0.1);
}
.tram {
  stroke: #EC407A;
  fill: #EC407A;
  fill-opacity: 0.3;
  transition: all .5s ease;
}

.intersection-effect {
  position: absolute;
  border: 3px solid #0277bd;
  border-radius: 50% 50%;
  width: 10px;
  height: 10px;
  box-shadow: 0 0 5px #666;
}

.label {
  font-family: monospace;
  font-size: 11px;
  position: absolute;
  right: 5px;
  color: rgba(255, 255, 255, 0.9);
  transition: opacity 8s ease-in;
  opacity: 1;
}
.label.enter {
  opacity: 0;
}

.leaflet-tile-container img {
  box-shadow: 0 0 1px rgba(0, 0, 0, 0.05);
}

h1 {
  color: rgba(255, 255, 255, 0.9);
  font-family: monospace;
  font-size: 20px;
  font-style: normal;
  margin: 20px;
}
              
            
!

JS

              
                const MQTT_URL = 'wss://mqtt.hsl.fi/';
const GRAPHQL_URL = 'https://api.digitransit.fi/routing/v1/routers/hsl/index/graphql';
const STOP_INTERSECT_DISTANCE = 5;

const SCALE = [
  new Tone.Buffer('https://s3-us-west-2.amazonaws.com/s.cdpn.io/969699/scale-G2.mp3'),
  new Tone.Buffer('https://s3-us-west-2.amazonaws.com/s.cdpn.io/969699/scale-A2.mp3'),
  new Tone.Buffer('https://s3-us-west-2.amazonaws.com/s.cdpn.io/969699/scale-C3.mp3'),
  new Tone.Buffer('https://s3-us-west-2.amazonaws.com/s.cdpn.io/969699/scale-D3.mp3'),
  new Tone.Buffer('https://s3-us-west-2.amazonaws.com/s.cdpn.io/969699/scale-E3.mp3'),
  new Tone.Buffer('https://s3-us-west-2.amazonaws.com/s.cdpn.io/969699/scale-G3.mp3'),
  new Tone.Buffer('https://s3-us-west-2.amazonaws.com/s.cdpn.io/969699/scale-A3.mp3'),
  new Tone.Buffer('https://s3-us-west-2.amazonaws.com/s.cdpn.io/969699/scale-C4.mp3'),
  new Tone.Buffer('https://s3-us-west-2.amazonaws.com/s.cdpn.io/969699/scale-D4.mp3'),
  new Tone.Buffer('https://s3-us-west-2.amazonaws.com/s.cdpn.io/969699/scale-E4.mp3')
];

const RHYTHM_GRAMMAR = {
  pattern: [['#cell#', '#pattern#'], ['#cell#', '#cell#']],
  cell: [['#twoCell#'], ['#threeCell#']],
  twoCell: [['8n', '8n'], ['4n']],
  threeCell: [['8n', '8n', '8n'], ['4n', '8n'], ['8n', '4n']]
}

const compressor = new Tone.Compressor().toMaster();
const trams = new Map();
const stops = new Map();
const incomingIntersections = [];
const showingLabels = SCALE.map(() => []);
const timeFormat = new Intl.DateTimeFormat([], {
  timeZone: 'Europe/Helsinki',
  hour: 'numeric', minute: 'numeric'
});
const effectsEl = document.querySelector('#effects');
const timeEl = document.querySelector('#current-time');
let rhythmPattern = new Tone.CtrlPattern(expandRhythmPattern(), 'up');
let latLngBounds;


// Initialize the map
patchMapTileGapBug();
const map = L.map('map', {
  center: [60.1799, 24.9384],
  zoom: 13,
  zoomControl: false,
  zoomSnap: 0,
  boxZoom: false,
  doubleClickZoom: false,
  scrollWheelZoom: false,
  dragging: false,
  inertia: false,
  zoomAnimation: false,
  keyboard: false,
  touchZoom: false,
  attributionControl: false
});
L.tileLayer('http://{s}.basemaps.cartocdn.com/dark_all/{z}/{x}/{y}.png', {
  attribution: 'Map data &copy; <a href="http://www.openstreetmap.org/copyright">OpenStreetMap</a>. Map imagery &copy; <a href="http://cartodb.com/attributions">CartoDB</a>',
  subdomains: 'abcd',
  maxZoom: 19
}).addTo(map);
map.addControl(L.control.attribution({
  position: 'bottomright',
  prefix: 'By <a href="https://twitter.com/teropa">@teropa</a>. Data from <a href="http://dev.hsl.fi/">HSL</a>'
}));


// Time tick: Update on-screen clock once a second and change the rhythm pattern once a minute
setInterval(() => {
  timeEl.textContent = timeFormat.format(new Date());
  if (new Date().getSeconds() === 0) {
    const newPtn = expandRhythmPattern();
    rhythmPattern = new Tone.CtrlPattern(newPtn, 'up');
  }
}, 1000);

function expandRhythmPattern(token = '#pattern#') {
  if (token.startsWith('#') && token.endsWith('#')) {
    const options = RHYTHM_GRAMMAR[token.substring(1, token.length - 1)];
    const choice = options[Math.floor(Math.random() * options.length)];
    return choice.reduce((result, token) => result.concat(expandRhythmPattern(token)), []);
  } else {
    return [token];
  }
}

// Load stops from the API
fetch(GRAPHQL_URL, {
  method: 'POST',
  headers: { 'Content-Type': 'application/graphql' },
  body: '{ routes(modes: "TRAM") { shortName id stops { id name lat lon }}}'
}
).then(res => res.json())
  .then(res => {
    let minLatLng, maxLatLng;
    res.data.routes.forEach(route => {
      const routeStops = new Map();
      route.stops.forEach((stop, idx) => {
        routeStops.set(stop.id, { pos: new L.LatLng(stop.lat, stop.lon), name: stop.name });
        if (!minLatLng || minLatLng.lat < stop.lat) {
          minLatLng = new L.LatLng(stop.lat, stop.lon);
        }
        if (!maxLatLng || maxLatLng.lat > stop.lat) {
          maxLatLng = new L.LatLng(stop.lat, stop.lon);
        }
      });
      stops.set(route.shortName, routeStops);
    });
    latLngBounds = new L.LatLngBounds(minLatLng, maxLatLng);
    map.fitBounds(latLngBounds, { padding: new L.Point(10, 10) });
  });

// Connect to tram data feed, push all incoming messages to the queue
const clientId = new Date().toString() + Math.random();
const client = new Paho.MQTT.Client(MQTT_URL, clientId);
client.onMessageArrived = message => {
  let parsed = JSON.parse(message.payloadString);
  processMessage(parsed);
}
client.connect({ onSuccess: () => {
  client.subscribe('/hfp/v1/journey/ongoing/tram/#') 
}});

function processMessage({ VP: { desi, lat, long, tsi, veh } }) {
  const pos = L.latLng(lat, long);
  let tram;
  if (trams.has(veh)) {
    tram = trams.get(veh);
  } else {
    tram = {
      desi: '' + desi,
      veh,
      marker: L.circleMarker(pos, { className: 'tram', radius: 5 })
    };
    trams.set(veh, tram);
  }
  tram.previousPos = tram.pos;
  tram.previousPt = tram.pt;
  tram.pos = pos;
  tram.pt = map.latLngToContainerPoint(pos);

  const intersectedStop = detectStopIntersection(tram);
  const intersectedIsNew = intersectedStop && intersectedStop !== tram.lastIntersectedStop;
  tram.lastIntersectedStop = intersectedStop;

  if (intersectedIsNew) {
    incomingIntersections.push({tram, intersectedStop});
  }
  tram.marker.setLatLng(pos);
  tram.marker.addTo(map);
}

// Consume the queue following the current rhythm pattern
function dequeNext(time) {
  if (incomingIntersections.length) {
    let { tram, intersectedStop } = incomingIntersections.shift();
    playIntersection(time, tram, intersectedStop);
    Tone.Draw.schedule(() => {
      drawRing(tram);
      drawLabel(tram, intersectedStop);
    }, time);
  }
  Tone.Transport.schedule(dequeNext, '+' + rhythmPattern.next());
}
Tone.Buffer.on('load', () => Tone.Transport.schedule(dequeNext, '+' + rhythmPattern.next()));



function drawRing(tram) {
  const centerX = document.documentElement.offsetWidth / 2;
  const centerY = document.documentElement.offsetHeight / 2;
  const driftX = tram.previousPt ? (tram.pt.x - tram.previousPt.x) / 3 : 0;
  const driftY = tram.previousPt ? (tram.pt.y - tram.previousPt.y) / 3 : 0;
  const toX = (centerX - tram.pt.x) * 4.8 / 5 + driftX;
  const toY = (centerY - tram.pt.y) * 4.8 / 5 + driftY;
  const toZ = 490;
  const el = document.createElement('div');
  el.classList.add('intersection-effect');
  el.style.top = `${tram.pt.y - 8}px`;
  el.style.left = `${tram.pt.x - 8}px`;
  effectsEl.appendChild(el);
  el.animate([
    { opacity: 0, transform: 'translate3d(0, 0, 0)' },
    { opacity: 1, transform: 'translate3d(0, 0, 0)', offset: 0.2 },
    { opacity: 0, transform: `translate3d(${toX}px, ${toY}px, ${toZ}px)` },
  ], {
      duration: 6000,
      easing: 'cubic-bezier(0.215, 0.61, 0.355, 1)'
    }).onfinish = () => el.remove();
}

function drawLabel(tram, stop) {
  if (tram.pt.y < 0 || tram.pt.y > document.documentElement.offsetHeight) {
    return
  }

  const noteHeight = document.documentElement.offsetHeight / SCALE.length;
  const labelNote = Math.floor(tram.pt.y / noteHeight);
  const labelBaseY = labelNote * noteHeight + 5;
  let labelIndex = -1;
  for (let i = 0; i < showingLabels[labelNote].length; i++) {
    if (!showingLabels[labelNote][i]) {
      labelIndex = i;
    }
  }
  if (labelIndex === -1) labelIndex = showingLabels[labelNote].length;

  const labelEl = document.createElement('div');
  labelEl.classList.add('label');
  labelEl.style.top = `${labelBaseY + labelIndex * 13}px`;
  labelEl.textContent = `${tram.desi} ${stop.name}`;
  effectsEl.appendChild(labelEl);
  showingLabels[labelNote][labelIndex] = labelEl;
  setTimeout(() => labelEl.classList.add('enter'), 0);
  setTimeout(() => {
    labelEl.remove();
    showingLabels[labelNote][labelIndex] = null;
  }, 8000);
}

function detectStopIntersection(tram) {
  for (const [stopId, stop] of stops.get(tram.desi).entries()) {
    const distanceToStop = tram.pos.distanceTo(stop.pos);
    if (distanceToStop < STOP_INTERSECT_DISTANCE) {
      return stop;
    }
  }
}

function playIntersection(time, tram, stop) {
  const screenWidth = document.documentElement.offsetWidth;
  const pan = Math.max(-1, Math.min(1, tram.pt.x / screenWidth * 2 - 1));
  const note = getNote(tram);
  if (note >= 0 && note < SCALE.length) {
    const panner = new Tone.Panner(pan).connect(compressor);
    const player = new Tone.Player(SCALE[note]).connect(panner);
    player.volume.value = -6;
    player.start(time);
    // Courtesy of @quinnirill https://twitter.com/quinnirill/status/907557984460570624
    player._source.playbackRate.linearRampToValueAtTime(1.035, time + 10);
    setTimeout(() => player.dispose(), 10000);
  } else {
    console.log('No note for', note);
  }
}

function getNote(tram) {
  const screenHeight = document.documentElement.offsetHeight;
  return Math.floor((screenHeight - tram.pt.y) / screenHeight * SCALE.length);
}

Tone.context.latencyHint = 'playback';
Tone.Transport.bpm.value = 50;
Tone.Transport.start();

function patchMapTileGapBug() {
  // Workaround for 1px lines appearing in some browsers due to fractional transforms
  // and resulting anti-aliasing. adapted from @cmulders' solution:
  // https://github.com/Leaflet/Leaflet/issues/3575#issuecomment-150544739
  let originalInitTile = L.GridLayer.prototype._initTile;
  if (originalInitTile.isPatched) return;
  L.GridLayer.include({
    _initTile: function (tile) {
      originalInitTile.call(this, tile);

      var tileSize = this.getTileSize();

      tile.style.width = tileSize.x + 1 + 'px';
      tile.style.height = tileSize.y + 1 + 'px';
    }
  });
  L.GridLayer.prototype._initTile.isPatched = true;
}

window.addEventListener('resize', () => {
  map.fitBounds(latLngBounds, { padding: new L.Point(10, 10) });
});
StartAudioContext(Tone.context, document.documentElement);
              
            
!
999px

Console