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Bootstrapの新しいバージョンがあります。

Text (テキスト)

配置、折り返し、太字などを制御するための一般的なテキストユーティリティです。

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Text alignment

テキストアライメント(配置)クラスを使用して、テキストを簡単に配置できます。 開始、終了、中央揃えには、グリッドシステムと同じ viewport 幅のブレークポイントを使用するレスポンシブクラスが利用できます。

Start aligned text on all viewport sizes.

Center aligned text on all viewport sizes.

End aligned text on all viewport sizes.

Start aligned text on viewports sized SM (small) or wider.

Start aligned text on viewports sized MD (medium) or wider.

Start aligned text on viewports sized LG (large) or wider.

Start aligned text on viewports sized XL (extra-large) or wider.

<p class="text-start">Start aligned text on all viewport sizes.</p>
<p class="text-center">Center aligned text on all viewport sizes.</p>
<p class="text-end">End aligned text on all viewport sizes.</p>

<p class="text-sm-start">Start aligned text on viewports sized SM (small) or wider.</p>
<p class="text-md-start">Start aligned text on viewports sized MD (medium) or wider.</p>
<p class="text-lg-start">Start aligned text on viewports sized LG (large) or wider.</p>
<p class="text-xl-start">Start aligned text on viewports sized XL (extra-large) or wider.</p>
Note that we don’t provide utility classes for justified text. While, aesthetically, justified text might look more appealing, it does make word-spacing more random and therefore harder to read.

Text wrapping and overflow

.text-wrap でテキストを折り返しできます。

This text should wrap. 
<div class="badge bg-primary text-wrap" style="width: 6rem;">
  This text should wrap.
</div>

.text-nowrap にするとテキスト折り返しを抑止します。

This text should overflow the parent. 
<div class="text-nowrap bd-highlight" style="width: 8rem;">
  This text should overflow the parent.
</div>

Word break

.text-break を使って word-wrap: break-word と word-break: break-word を設定することで、長い文字列がレイアウトを崩すのを防ぎます。ブラウザのサポート範囲を広げるために、より一般的な overflow-wrap の代わりに word-wrap を使用し、フレックスコンテナの問題を避けるために非推奨の word-break: break-word を追加します。

mmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmm

<p class="text-break">mmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmm</p>
Note that breaking words isn’t possible in Arabic, which is the most used RTL language. Therefore .text-break is removed from our RTL compiled CSS.

Text transform

テキストの大文字・小文字化、capitalization クラスを利用できます。

Lowercased text.

Uppercased text.

CapiTaliZed text.

<p class="text-lowercase">Lowercased text.</p>
<p class="text-uppercase">Uppercased text.</p>
<p class="text-capitalize">CapiTaliZed text.</p>

.text-capitalize は各単語の最初の文字だけを変更します。

Font size

見出しクラス（例： .h1–.h6）は font-size、 font-weight、および line-heightを適用します. 下記の例は font-size を適用します。サイズは 見出し要素と一致しているので、数値を上げるとサイズが小さくなります。

.fs-1 text

.fs-2 text

.fs-3 text

.fs-4 text

.fs-5 text

.fs-6 text

<p class="fs-1">.fs-1 text</p>
<p class="fs-2">.fs-2 text</p>
<p class="fs-3">.fs-3 text</p>
<p class="fs-4">.fs-4 text</p>
<p class="fs-5">.fs-5 text</p>
<p class="fs-6">.fs-6 text</p>

Sass マップの$font-sizesを変更することで、利用可能なfont-sizeをカスタマイズすることができます。

$font-sizes: (
  1: $h1-font-size,
  2: $h2-font-size,
  3: $h3-font-size,
  4: $h4-font-size,
  5: $h5-font-size,
  6: $h6-font-size
);

Font weight and italics

テキストの font-weight や font-style を変更できます。 font-style utilities は.fst- *と省略され、 font-weight utilities は .fw- *と省略されます。

Bold text.

Bolder weight text (relative to the parent element).

Normal weight text.

Light weight text.

Lighter weight text (relative to the parent element).

Italic text.

Text with normal font style

<p class="fw-bold">Bold text.</p>
<p class="fw-bolder">Bolder weight text (relative to the parent element).</p>
<p class="fw-normal">Normal weight text.</p>
<p class="fw-light">Light weight text.</p>
<p class="fw-lighter">Lighter weight text (relative to the parent element).</p>
<p class="fst-italic">Italic text.</p>
<p class="fst-normal">Text with normal font style</p>

Line height

.lh-* ユーティリティで line-height を変更できます。

This is a long paragraph written to show how the line-height of an element is affected by our utilities. Classes are applied to the element itself or sometimes the parent element. These classes can be customized as needed with our utility API.

This is a long paragraph written to show how the line-height of an element is affected by our utilities. Classes are applied to the element itself or sometimes the parent element. These classes can be customized as needed with our utility API.

This is a long paragraph written to show how the line-height of an element is affected by our utilities. Classes are applied to the element itself or sometimes the parent element. These classes can be customized as needed with our utility API.

This is a long paragraph written to show how the line-height of an element is affected by our utilities. Classes are applied to the element itself or sometimes the parent element. These classes can be customized as needed with our utility API.

<p class="lh-1">This is a long paragraph written to show how the line-height of an element is affected by our utilities. Classes are applied to the element itself or sometimes the parent element. These classes can be customized as needed with our utility API.</p>
<p class="lh-sm">This is a long paragraph written to show how the line-height of an element is affected by our utilities. Classes are applied to the element itself or sometimes the parent element. These classes can be customized as needed with our utility API.</p>
<p class="lh-base">This is a long paragraph written to show how the line-height of an element is affected by our utilities. Classes are applied to the element itself or sometimes the parent element. These classes can be customized as needed with our utility API.</p>
<p class="lh-lg">This is a long paragraph written to show how the line-height of an element is affected by our utilities. Classes are applied to the element itself or sometimes the parent element. These classes can be customized as needed with our utility API.</p>

Monospace

.font-monospace を使って等幅フォントに変更できます。

This is in monospace

<p class="font-monospace">This is in monospace</p>

Reset color

テキストやリンクの色を .text-reset でリセットし、親から色を継承するようにします。

Muted text with a reset link. 

<p class="text-muted">
  Muted text with a <a href="#" class="text-reset">reset link</a>.
</p>

Text decoration

decoration classes で文字を装飾できます。

This text has a line underneath it.

This text has a line going through it.

This link has its text decoration removed 
<p class="text-decoration-underline">This text has a line underneath it.</p>
<p class="text-decoration-line-through">This text has a line going through it.</p>
<a href="#" class="text-decoration-none">This link has its text decoration removed</a>

Sass

Variables

// stylelint-disable value-keyword-case
$font-family-sans-serif:      system-ui, -apple-system, "Segoe UI", Roboto, "Helvetica Neue", Arial, "Noto Sans", "Liberation Sans", sans-serif, "Apple Color Emoji", "Segoe UI Emoji", "Segoe UI Symbol", "Noto Color Emoji";
$font-family-monospace:       SFMono-Regular, Menlo, Monaco, Consolas, "Liberation Mono", "Courier New", monospace;
// stylelint-enable value-keyword-case
$font-family-base:            var(--#{$variable-prefix}font-sans-serif);
$font-family-code:            var(--#{$variable-prefix}font-monospace);

// $font-size-root effects the value of `rem`, which is used for as well font sizes, paddings and margins
// $font-size-base effects the font size of the body text
$font-size-root:              null;
$font-size-base:              1rem; // Assumes the browser default, typically `16px`
$font-size-sm:                $font-size-base * .875;
$font-size-lg:                $font-size-base * 1.25;

$font-weight-lighter:         lighter;
$font-weight-light:           300;
$font-weight-normal:          400;
$font-weight-bold:            700;
$font-weight-bolder:          bolder;

$font-weight-base:            $font-weight-normal;

$line-height-base:            1.5;
$line-height-sm:              1.25;
$line-height-lg:              2;

$h1-font-size:                $font-size-base * 2.5;
$h2-font-size:                $font-size-base * 2;
$h3-font-size:                $font-size-base * 1.75;
$h4-font-size:                $font-size-base * 1.5;
$h5-font-size:                $font-size-base * 1.25;
$h6-font-size:                $font-size-base;

Maps

Font-size utilities はこの map と, utilities API を組み合わせて生成されます。

$font-sizes: (
  1: $h1-font-size,
  2: $h2-font-size,
  3: $h3-font-size,
  4: $h4-font-size,
  5: $h5-font-size,
  6: $h6-font-size
);

Utilities API

Font と text utilities は utilities API scss/_utilities.scss で宣言されています。 Learn how to use the utilities API.

    "font-family": (
      property: font-family,
      class: font,
      values: (monospace: var(--#{$variable-prefix}font-monospace))
    ),
    "font-size": (
      rfs: true,
      property: font-size,
      class: fs,
      values: $font-sizes
    ),
    "font-style": (
      property: font-style,
      class: fst,
      values: italic normal
    ),
    "font-weight": (
      property: font-weight,
      class: fw,
      values: (
        light: $font-weight-light,
        lighter: $font-weight-lighter,
        normal: $font-weight-normal,
        bold: $font-weight-bold,
        bolder: $font-weight-bolder
      )
    ),
    "line-height": (
      property: line-height,
      class: lh,
      values: (
        1: 1,
        sm: $line-height-sm,
        base: $line-height-base,
        lg: $line-height-lg,
      )
    ),
    "text-align": (
      responsive: true,
      property: text-align,
      class: text,
      values: (
        start: left,
        end: right,
        center: center,
      )
    ),
    "text-decoration": (
      property: text-decoration,
      values: none underline line-through
    ),
    "text-transform": (
      property: text-transform,
      class: text,
      values: lowercase uppercase capitalize
    ),
    "white-space": (
      property: white-space,
      class: text,
      values: (
        wrap: normal,
        nowrap: nowrap,
      )
    ),
    "word-wrap": (
      property: word-wrap word-break,
      class: text,
      values: (break: break-word),
      rtl: false
    ),