<p>: 段落元素

p {
  margin-bottom: 2em; /* increase white space after a paragraph */
}

<p>
  This is the first paragraph of text. This is the first paragraph of text. This
  is the first paragraph of text. This is the first paragraph of text.
</p>
<p>
  This is the second paragraph. This is the second paragraph. This is the second
  paragraph. This is the second paragraph.
</p>

<p>
  Separating paragraphs with blank lines is easiest for readers to scan, but
  they can also be separated by indenting their first lines. This is often used
  to take up less space, such as to save paper in print.
</p>

<p>
  Writing that is intended to be edited, such as school papers and rough drafts,
  uses both blank lines and indentation for separation. In finished works,
  combining both is considered redundant and amateurish.
</p>

<p>
  In very old writing, paragraphs were separated with a special character: ¶,
  the <i>pilcrow</i>. Nowadays, this is considered claustrophobic and hard to
  read.
</p>

<p>
  How hard to read? See for yourself:
  <button data-toggle-text="Oh no! Switch back!">
    Use pilcrow for paragraphs
  </button>
</p>

p {
  margin: 0;
  text-indent: 3ch;
}

p.pilcrow {
  text-indent: 0;
  display: inline;
}
p.pilcrow + p.pilcrow::before {
  content: " ¶ ";
}

document.querySelector("button").addEventListener("click", (event) => {
  document.querySelectorAll("p").forEach((paragraph) => {
    paragraph.classList.toggle("pilcrow");
  });

  [event.target.innerText, event.target.dataset.toggleText] = [
    event.target.dataset.toggleText,
    event.target.innerText,
  ];
});