HTML の画像

<img src="dinosaur.jpg" alt="Dinosaur" />

<img src="images/dinosaur.jpg" alt="Dinosaur" />

<img src="https://www.example.com/images/dinosaur.jpg" alt="Dinosaur" />

<img
  src="images/dinosaur.jpg"
  alt="The head and torso of a dinosaur skeleton;
          it has a large head with long sharp teeth" />

<img
  src="images/dinosaur.jpg"
  alt="The head and torso of a dinosaur skeleton;
          it has a large head with long sharp teeth"
  width="400"
  height="341" />

<h1>Images in HTML</h1>

<img
  src="dinosaur.jpg"
  alt="The head and torso of a dinosaur skeleton; it has a large head with long sharp teeth"
  title="A T-Rex on display in the Manchester University Museum" />
<blockquote>
  <p>
    But down there it would be dark now, and not the lovely lighted aquarium she
    imagined it to be during the daylight hours, eddying with schools of tiny,
    delicate animals floating and dancing slowly to their own serene currents
    and creating the look of a living painting. That was wrong, in any case. The
    ocean was different from an aquarium, which was an artificial environment.
    The ocean was a world. And a world is not art. Dorothy thought about the
    living things that moved in that world: large, ruthless and hungry. Like us
    up here.
  </p>
  <footer>- Rachel Ingalls, <cite>Mrs. Caliban</cite></footer>
</blockquote>

<img
  src="images/dinosaur.jpg"
  alt="The head and torso of a dinosaur skeleton;
          it has a large head with long sharp teeth"
  width="400"
  height="341"
  title="A T-Rex on display in the Manchester University Museum" />

https://raw.githubusercontent.com/mdn/learning-area/master/html/multimedia-and-embedding/images-in-html/dinosaur_small.jpg

<h2>ライブ出力</h2>

<div class="output" style="min-height: 50px;"></div>

<h2>編集可能なコード</h2>
<p class="a11y-label">
  Esc を押すとコード領域からフォーカスを移動させることができます（Tab はタブ文字を挿入します）。
</p>

<textarea id="code" class="input" style="min-height: 100px; width: 95%">
<img>
</textarea>

<div class="playable-buttons">
  <input id="reset" type="button" value="リセット" />
  <input id="solution" type="button" value="答えを表示" />
</div>

html {
  font-family: sans-serif;
}

h2 {
  font-size: 16px;
}

.a11y-label {
  margin: 0;
  text-align: right;
  font-size: 0.7rem;
  width: 98%;
}

body {
  margin: 10px;
  background: #f5f9fa;
}

const textarea = document.getElementById("code");
const reset = document.getElementById("reset");
const solution = document.getElementById("solution");
const output = document.querySelector(".output");
const code = textarea.value;
let userEntry = textarea.value;

function updateCode() {
  output.innerHTML = textarea.value;
}

const htmlSolution =
  '<img src="https://raw.githubusercontent.com/mdn/learning-area/master/html/multimedia-and-embedding/images-in-html/dinosaur_small.jpg"\n alt="The head and torso of a dinosaur skeleton; it has a large head with long sharp teeth"\n width="200"\n height="171"\n title="A T-Rex on display in the Manchester University Museum">';
let solutionEntry = htmlSolution;

reset.addEventListener("click", () => {
  textarea.value = code;
  userEntry = textarea.value;
  solutionEntry = htmlSolution;
  solution.value = "答えを表示";
  updateCode();
});

solution.addEventListener("click", () => {
  if (solution.value === "答えを表示") {
    textarea.value = solutionEntry;
    solution.value = "答えを隠す";
  } else {
    textarea.value = userEntry;
    solution.value = "答えを表示";
  }
  updateCode();
});

textarea.addEventListener("input", updateCode);
window.addEventListener("load", updateCode);

// stop tab key tabbing out of textarea and
// make it write a tab at the caret position instead

textarea.onkeydown = (e) => {
  if (e.code === "Tab") {
    e.preventDefault();
    insertAtCaret("\t");
  }

  if (e.code === "Escape") {
    textarea.blur();
  }
};

function insertAtCaret(text) {
  const scrollPos = textarea.scrollTop;
  let caretPos = textarea.selectionStart;

  const front = textarea.value.substring(0, caretPos);
  const back = textarea.value.substring(
    textarea.selectionEnd,
    textarea.value.length,
  );
  textarea.value = front + text + back;
  caretPos += text.length;
  textarea.selectionStart = caretPos;
  textarea.selectionEnd = caretPos;
  textarea.focus();
  textarea.scrollTop = scrollPos;
}

// Update the saved userCode every time the user updates the text area code

textarea.onkeyup = function () {
  // We only want to save the state when the user code is being shown,
  // not the solution, so that solution is not saved over the user code
  if (solution.value === "答えを表示") {
    userEntry = textarea.value;
  } else {
    solutionEntry = textarea.value;
  }

  updateCode();
};

<div class="figure">
  <img
    src="images/dinosaur.jpg"
    alt="The head and torso of a dinosaur skeleton;
            it has a large head with long sharp teeth"
    width="400"
    height="341" />

  <p>マンチェスター大学博物館に展示されている T-Rex。</p>
</div>

<figure>
  <img
    src="images/dinosaur.jpg"
    alt="The head and torso of a dinosaur skeleton;
            it has a large head with long sharp teeth"
    width="400"
    height="341" />

  <figcaption>
    マンチェスター大学博物館に展示されている T-Rex。
  </figcaption>
</figure>

<h2>ライブ出力</h2>

<div class="output" style="min-height: 50px;"></div>

<h2>編集可能なコード</h2>
<p class="a11y-label">
  Esc を押すとコード領域からフォーカスを移動させることができます（Tab
  はタブ文字を挿入します）。
</p>

<textarea
  id="code"
  class="input"
  style="min-height: 100px; width: 95%"></textarea>

<div class="playable-buttons">
  <input id="reset" type="button" value="リセット" />
  <input id="solution" type="button" value="答えを表示" />
</div>

html {
  font-family: sans-serif;
}

h2 {
  font-size: 16px;
}

.a11y-label {
  margin: 0;
  text-align: right;
  font-size: 0.7rem;
  width: 98%;
}

body {
  margin: 10px;
  background: #f5f9fa;
}

const textarea = document.getElementById("code");
const reset = document.getElementById("reset");
const solution = document.getElementById("solution");
const output = document.querySelector(".output");
const code = textarea.value;
let userEntry = textarea.value;

function updateCode() {
  output.innerHTML = textarea.value;
}

const htmlSolution =
  '<figure>\n <img src="https://raw.githubusercontent.com/mdn/learning-area/master/html/multimedia-and-embedding/images-in-html/dinosaur_small.jpg"\n alt="The head and torso of a dinosaur skeleton; it has a large head with long sharp teeth"\n width="200"\n height="171">\n <figcaption>A T-Rex on display in the Manchester University Museum</figcaption>\n</figure>';
let solutionEntry = htmlSolution;

reset.addEventListener("click", () => {
  textarea.value = code;
  userEntry = textarea.value;
  solutionEntry = htmlSolution;
  solution.value = "答えを表示";
  updateCode();
});

solution.addEventListener("click", () => {
  if (solution.value === "答えを表示") {
    textarea.value = solutionEntry;
    solution.value = "答えを隠す";
  } else {
    textarea.value = userEntry;
    solution.value = "答えを表示";
  }
  updateCode();
});

textarea.addEventListener("input", updateCode);
window.addEventListener("load", updateCode);

// stop tab key tabbing out of textarea and
// make it write a tab at the caret position instead

textarea.onkeydown = (e) => {
  if (e.code === "Tab") {
    e.preventDefault();
    insertAtCaret("\t");
  }

  if (e.code === "Escape") {
    textarea.blur();
  }
};

function insertAtCaret(text) {
  const scrollPos = textarea.scrollTop;
  let caretPos = textarea.selectionStart;

  const front = textarea.value.substring(0, caretPos);
  const back = textarea.value.substring(
    textarea.selectionEnd,
    textarea.value.length,
  );
  textarea.value = front + text + back;
  caretPos += text.length;
  textarea.selectionStart = caretPos;
  textarea.selectionEnd = caretPos;
  textarea.focus();
  textarea.scrollTop = scrollPos;
}

// Update the saved userCode every time the user updates the text area code

textarea.onkeyup = () => {
  // We only want to save the state when the user code is being shown,
  // not the solution, so that solution is not saved over the user code
  if (solution.value === "答えを表示") {
    userEntry = textarea.value;
  } else {
    solutionEntry = textarea.value;
  }

  updateCode();
};

p {
  background-image: url("images/dinosaur.jpg");
}