CSS grid-row-gap

<!doctype html>
<title>Example</title>
<style>
#grid {
  display: grid;
  grid: auto auto auto / auto auto auto;
  grid-row-gap: 10px;
}
#grid > div {
  background-color: slateblue;
  color: white;
  font-size: 4vw;
  padding: 10px;
}
</style>
<div id="grid">
  <div>1</div>
  <div>2</div>
  <div>3</div>
  <div>4</div>
  <div>5</div>
  <div>6</div>
  <div>7</div>
  <div>8</div>
  <div>9</div>
</div>

The CSS grid-gap property sets the gutters between the rows of a grid.

If your browser supports CSS grids, the above example should look like this:

Screenshot of a grid with it's grid-row-gap set.

The grid-row-gap property sets the gutters between the rows only. You can use the grid-column-gap to set the gutters on the columns, or you can use the grid-gap shorthand property to set both the row gutters and the column gutters at the same time.

You can specify the gutter as a non-negative length or percentage value. Here are examples of some valid gutter declarations:

Syntax

Here's the official syntax of the grid-row-gap property:

Possible Values

The length-percentage data type means that you can provide either a length or a percentage, where percentage will resolve to a length.

Negative values are invalid.

A percentage value is relative to the size of the grid container.

In addition, all CSS properties also accept the following CSS-wide keyword values as the sole component of their property value:

initial: Represents the value specified as the property's initial value.
inherit: Represents the computed value of the property on the element's parent.
unset: This value acts as either inherit or initial, depending on whether the property is inherited or not. In other words, it sets all properties to their parent value if they are inheritable or to their initial value if not inheritable.

Basic Property Information

Initial Value: 0
Applies To: Grid containers
Inherited?: No
Media: Visual
Animation type: As length, percentage, or calc (see example)

CSS Specifications

The grid-row-gap property is defined in CSS Grid Layout Module Level 1 (W3C Candidate Recommendation, 9 February 2017).

Browser Support

The following table provided by Caniuse.com shows the level of browser support for this feature.

Vendor Prefixes

For maximum browser compatibility many web developers add browser-specific properties by using extensions such as -webkit- for Safari, Google Chrome, and Opera (newer versions), -ms- for Internet Explorer, -moz- for Firefox, -o- for older versions of Opera etc. As with any CSS property, if a browser doesn't support a proprietary extension, it will simply ignore it.

This practice is not recommended by the W3C, however in many cases, the only way you can test a property is to include the CSS extension that is compatible with your browser.

The major browser manufacturers generally strive to adhere to the W3C specifications, and when they support a non-prefixed property, they typically remove the prefixed version. Also, W3C advises vendors to remove their prefixes for properties that reach Candidate Recommendation status.

Many developers use Autoprefixer, which is a postprocessor for CSS. Autoprefixer automatically adds vendor prefixes to your CSS so that you don't need to. It also removes old, unnecessary prefixes from your CSS.

You can also use Autoprefixer with preprocessors such as Less and Sass.