word-break

The word-break property in CSS can be used to change when line breaks ought to occur. Normally, line breaks in text can only occur in certain spaces, like when there is a space or a hyphen.

In the example below we can make the word-break between letters instead:

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

If we then set the width of the text to one em, the word will break by each letter:

This value is often used in places with user generated content so that long strings don’t risk breaking the layout. One very common example is a long copy and pasted URL. If that URL has no hyphens, it can extend beyond the parent box and look bad or worse, cause layout problems.

Values

• normal: use the default rules for word breaking.
• break-all: any word/letter can break onto the next line.
• keep-all: for Chinese, Japanese and Korean text words are not broken. Otherwise this is the same as normal.

This property is also often used in conjunction with the hyphens property so that when breaks occur a hypen is inserted, as per the standard in books.

The full usage, with needed vendor prefixes, is:

 -ms-word-break: break-all;
     word-break: break-all;

     /* Non standard for WebKit */
     word-break: break-word;

-webkit-hyphens: auto;
   -moz-hyphens: auto;
        hyphens: auto;

Using these properties on the universal selector can be useful if you have a site with a lot of user-generated content. Although fair warning, it can look weird on titles and pre-formatted text (

Related

• overflow-wrap
• hyphens
• white-space
• Handling Long Words and URLs

Browser Support

Safari and iOS support the break-all value but not keep-all