CSSda em dan foydalanish amaliyotlari

Keling, HTML sahifasining to‘liq kodini ko‘rib chiqaylik:

html<html>
  <head>
    <title></title>
  </head>
  <body>
    <main>
      <div>
        <p>
          text
        </p>
      </div>
    </main>
  </body>
<html>

Standart bo‘yicha sahifadagi barcha teglar ma’lum shrift o‘lchamiga ega. Aslida gap shundaki, html tegi standart bo‘yicha ma’lum shrift o‘lchamiga ega:

csshtml {
  font-size: 16px; /* standart qiymat */
}

Shuning uchun biz sahifa teglariga o‘lchamlarni em da ko‘rsatishimiz mumkin. Bunda ular o‘z o‘lchamlarini bevosota ota-onalariga nisbatan hisoblab chiqadilar.

Keling, masalan, main tegiga shrift o‘lchamini ko‘rsatamiz:

cssmain {
  font-size: 1.5em; /* 24px ga mos keladi */
}

Endi esa div tegiga shrift o‘lchamini ko‘rsatamiz:

cssdiv {
  font-size: 2em; /* 48px ga mos keladi */
}

html<main>
  <h1>header</h1>
  <div>
    <p>
      text
    </p>
    <p>
      text
    </p>
  </div>
  <div>
    <p>
      text
    </p>
    <p>
      text
    </p>
  </div>
</main>

cssmain {
  margin: 16px auto;
}

h1 {
  font-size: 32px;
}
p {
  font-size: 32px;
}

cssmain {
  margin: 32px auto;
}

h1 {
  font-size: 32px;
}
div {
  font-size: 16px;
  margin-bottom: 32px;
}
p {
  font-size: 20px;
}