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Script

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<!DOCTYPE html>
<html>
<head>
<title>Pixel Runner</title>
<style>
  body { margin:0; overflow:hidden; background:black; }
  canvas { display:block; margin:auto; background:#111; }
</style>
</head>
<body>

<canvas id="game" width="600" height="300"></canvas>

<script>
const canvas = document.getElementById("game");
const ctx = canvas.getContext("2d");

let player = { x:50, y:200, w:20, h:20, vy:0, jump:false };
let gravity = 0.5;
let obstacle = { x:600, y:220, w:20, h:20 };
let score = 0;

function drawPlayer() {
  ctx.fillStyle = "lime";
  ctx.fillRect(player.x, player.y, player.w, player.h);
}

function drawObstacle() {
  ctx.fillStyle = "red";
  ctx.fillRect(obstacle.x, obstacle.y, obstacle.w, obstacle.h);
}

function update() {
  ctx.clearRect(0,0,600,300);

  // gravity
  player.vy += gravity;
  player.y += player.vy;

  if(player.y > 200){
    player.y = 200;
    player.vy = 0;
    player.jump = false;
  }

  // obstacle move
  obstacle.x -= 5;
  if(obstacle.x < 0){
    obstacle.x = 600;
    score++;
  }

  // collision
  if(player.x < obstacle.x + obstacle.w &&
     player.x + player.w > obstacle.x &&
     player.y < obstacle.y + obstacle.h &&
     player.y + player.h > obstacle.y){
       alert("Game Over! Score: " + score);
       location.reload();
  }

  drawPlayer();
  drawObstacle();

  ctx.fillStyle = "white";
  ctx.fillText("Score: " + score, 10, 20);

  requestAnimationFrame(update);
}

document.addEventListener("keydown", function(e){
  if(e.code === "Space" && !player.jump){
    player.vy = -10;
    player.jump = true;
  }
});

update();
</script>

</body>
</html>

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Network Timeline

Performance Summary

Requests

Domains

2KB

Transfer Size

2KB

Content Size

98.0ms

Dom Content Loaded

112.0ms

First Paint

98.0ms

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Content Size (bytes)

Header Size (bytes)

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Timings (ms)

Total Time

Content Breakdown

Transfer Size (bytes)

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Requests