Examples

HTML

<!-- Learn about this code on MDN: https://developer.mozilla.org/en-US/docs/Web/CSS/word-break -->

<p>1. <code>word-break: normal</code></p>
<p class="normal narrow">This is a long and
 Honorificabilitudinitatibus califragilisticexpialidocious Taumatawhakatangihangakoauauotamateaturipukakapikimaungahoronukupokaiwhenuakitanatahu
 次の単語グレートブリテンおよび北アイルランド連合王国で本当に大きな言葉</p>

<p>2. <code>word-break: break-all</code></p>
<p class="breakAll narrow">This is a long and
 Honorificabilitudinitatibus califragilisticexpialidocious Taumatawhakatangihangakoauauotamateaturipukakapikimaungahoronukupokaiwhenuakitanatahu
 次の単語グレートブリテンおよび北アイルランド連合王国で本当に大きな言葉</p>

<p>3. <code>word-break: keep-all</code></p>
<p class="keepAll narrow">This is a long and
 Honorificabilitudinitatibus califragilisticexpialidocious Taumatawhakatangihangakoauauotamateaturipukakapikimaungahoronukupokaiwhenuakitanatahu
 次の単語グレートブリテンおよび北アイルランド連合王国で本当に大きな言葉</p>

<p>4. <code>word-break: break-word</code></p> 
<p class="breakWord narrow">This is a long and 
  Honorificabilitudinitatibus califragilisticexpialidocious Taumatawhakatangihangakoauauotamateaturipukakapikimaungahoronukupokaiwhenuakitanatahu 
  次の単語グレートブリテンおよび北アイルランド連合王国で本当に大きな言葉</p>
  
  <p>5. <code>word-break: normal; overflow-wrap: break-word;</code></p> 
<p class="normaloverflow narrow">This is a long and 
  Honorificabilitudinitatibus califragilisticexpialidocious Taumatawhakatangihangakoauauotamateaturipukakapikimaungahoronukupokaiwhenuakitanatahu 
  次の単語グレートブリテンおよび北アイルランド連合王国で本当に大きな言葉</p>

CSS

body {
  width: 300px;
  max-width: 400px;
  min-width: 400px;
}

.narrow {
  padding: 5px;
  border: 1px solid;
  display: inline-block;
  max-width: 100%;
}

.normal {
  word-break: normal;
}

.breakAll {
  word-break: break-all;
}

.keepAll {
  word-break: keep-all;
}

.breakWord { 
  word-break: break-word;
} 

.normaloverflow { 
word-break: normal;
overflow-wrap: break-word;
}