<input type="button">

<input class="styled" type="button" value="Add to favorites" />

.styled {
  border: 0;
  line-height: 2.5;
  padding: 0 20px;
  font-size: 1rem;
  text-align: center;
  color: #fff;
  text-shadow: 1px 1px 1px #000;
  border-radius: 10px;
  background-color: rgb(220 0 0 / 100%);
  background-image: linear-gradient(
    to top left,
    rgb(0 0 0 / 20%),
    rgb(0 0 0 / 20%) 30%,
    rgb(0 0 0 / 0%)
  );
  box-shadow:
    inset 2px 2px 3px rgb(255 255 255 / 60%),
    inset -2px -2px 3px rgb(0 0 0 / 60%);
}

.styled:hover {
  background-color: rgb(255 0 0 / 100%);
}

.styled:active {
  box-shadow:
    inset -2px -2px 3px rgb(255 255 255 / 60%),
    inset 2px 2px 3px rgb(0 0 0 / 60%);
}

<input type="button" value="クリックしてね" />

<input type="button" />

<form>
  <input type="button" value="マシンを起動" />
</form>
<p>マシンが停止しています。</p>

const button = document.querySelector("input");
const paragraph = document.querySelector("p");

button.addEventListener("click", updateButton);

function updateButton() {
  if (button.value === "マシンを起動") {
    button.value = "マシンを停止";
    paragraph.textContent = "マシンが起動しています！";
  } else {
    button.value = "マシンを起動";
    paragraph.textContent = "マシンが停止しています。";
  }
}

<form>
  <input type="button" value="マシンを起動" accesskey="s" />
</form>
<p>マシンが停止しています。</p>

const button = document.querySelector("input");
const paragraph = document.querySelector("p");

button.addEventListener("click", updateButton);

function updateButton() {
  if (button.value === "マシンを起動") {
    button.value = "マシンを停止";
    paragraph.textContent = "マシンが起動しています！";
  } else {
    button.value = "マシンを起動";
    paragraph.textContent = "マシンが停止しています。";
  }
}

<input type="button" value="Disable me" disabled />

<input type="button" value="Enabled" />

const button = document.querySelector("input");

button.addEventListener("click", disableButton);

function disableButton() {
  button.disabled = true;
  button.value = "Disabled";
  setTimeout(() => {
    button.disabled = false;
    button.value = "Enabled";
  }, 2000);
}

<fieldset>
  <legend>Button group</legend>
  <input type="button" value="Button 1" />
  <input type="button" value="Button 2" />
  <input type="button" value="Button 3" />
</fieldset>

const button = document.querySelector("input");
const fieldset = document.querySelector("fieldset");

button.addEventListener("click", disableButton);

function disableButton() {
  fieldset.disabled = true;
  setTimeout(() => {
    fieldset.disabled = false;
  }, 2000);
}

<div class="toolbar">
  <input type="color" aria-label="select pen color" />
  <input
    type="range"
    min="2"
    max="50"
    value="30"
    aria-label="select pen size" /><span class="output">30</span>
  <input type="button" value="Clear canvas" />
</div>

<canvas class="myCanvas">
  <p>Add suitable fallback here.</p>
</canvas>

body {
  background: #ccc;
  margin: 0;
  overflow: hidden;
}

.toolbar {
  background: #ccc;
  width: 150px;
  height: 75px;
  padding: 5px;
}

input[type="color"],
input[type="button"] {
  width: 90%;
  margin: 0 auto;
  display: block;
}

input[type="range"] {
  width: 70%;
}

span {
  position: relative;
  bottom: 5px;
}

const canvas = document.querySelector(".myCanvas");
const width = (canvas.width = window.innerWidth);
const height = (canvas.height = window.innerHeight - 85);
const ctx = canvas.getContext("2d");

ctx.fillStyle = "rgb(0 0 0)";
ctx.fillRect(0, 0, width, height);

const colorPicker = document.querySelector('input[type="color"]');
const sizePicker = document.querySelector('input[type="range"]');
const output = document.querySelector(".output");
const clearBtn = document.querySelector('input[type="button"]');

// 角度をラジアンに変換する
function degToRad(degrees) {
  return (degrees * Math.PI) / 180;
}

// 選択した大きさの値を反映

sizePicker.oninput = () => {
  output.textContent = sizePicker.value;
};

// マウスポインターと、ボタンが押されているかどうかを格納
let curX;
let curY;
let pressed = false;

// マウスポインターの座標を更新
document.onmousemove = (e) => {
  curX = e.pageX;
  curY = e.pageY;
};

canvas.onmousedown = () => {
  pressed = true;
};

canvas.onmouseup = () => {
  pressed = false;
};

clearBtn.onclick = () => {
  ctx.fillStyle = "rgb(0 0 0)";
  ctx.fillRect(0, 0, width, height);
};

function draw() {
  if (pressed) {
    ctx.fillStyle = colorPicker.value;
    ctx.beginPath();
    ctx.arc(
      curX,
      curY - 85,
      sizePicker.value,
      degToRad(0),
      degToRad(360),
      false,
    );
    ctx.fill();
  }

  requestAnimationFrame(draw);
}

draw();