Flex / Grid layouts not working on button or fieldset elements

I'm trying to center inner elements of a <button>-tag with flexbox's justify-content: center. But Safari does not center them. I can apply the same style to any other tags and it works as intended (see the <p>-tag). Only the button is left-aligned.

Try Firefox or Chrome and you can see the difference.

Is there any user agent style I have to overwrite? Or any other solution to this problem?

div {
  display: flex;
  flex-direction: column;
  width: 100%;
}
button, p {
  display: flex;
  flex-direction: row;
  justify-content: center;
}

<div>
  <button>
    <span>Test</span>
    <span>Test</span>
  </button>
  <p>
    <span>Test</span>
    <span>Test</span>
  </p>
</div>

And a jsfiddle: http://jsfiddle.net/z3sfwtn2/2/

The Problem

In some browsers the <button> element doesn't accept changes to its display value, beyond switching between block and inline-block. This means that a <button> element cannot be a flex or grid container, or a <table>, either.

In addition to <button> elements, you may find this constraint applying to <fieldset> and <legend> elements, as well.

See the bug reports below for more details.

Note: Although they cannot be flex containers, <button> elements can be flex items.

---

The Solution

There is a simple and easy cross-browser workaround to this problem:

Wrap the content of the button in a span, and make the span the flex container.

Adjusted HTML (wrapped button content in a span)

<div>
    <button>
        <span><!-- using a div also works but is not valid HTML -->
            <span>Test</span>
            <span>Test</span>
        </span>
    </button>
    <p>
        <span>Test</span>
        <span>Test</span>
    </p>
</div>

Adjusted CSS (targeted span)

button > span, p {
    display: flex;
    flex-direction: row;
    justify-content: center;
}

Revised Demo

---

References / Bug Reports

Flexbox on a <button> blockifies the contents but doesn't establish a flex formatting context

>User (Oriol Brufau): The children of the <button> are blockified, as dictates the flexbox spec. However, the <button> seems to establish a block formatting context instead of a flex one. > >User (Daniel Holbert): That is effectively what the HTML spec requires. Several HTML container-elements are "special" and effectively ignore their CSS display value in Gecko [aside from whether it's inline-level vs. block-level]. <button> is one of these. <fieldset> & <legend> are as well.

Add support for display:flex/grid and columnset layout inside <button> elements

> User (Daniel Holbert): > > <button> is not implementable (by browsers) in pure CSS, so they are a bit of a black box, from the perspective of CSS. This means that > they don't necessarily react in the same way that e.g. a <div> > would. > > This isn't specific to flexbox -- e.g. we don't render scrollbars if you put overflow:scroll on a button, and we don't render it as a > table if you put display:table on it. > > Stepping back even further, this isn't specific to <button>. Consider <fieldset> and <table> which also have special rendering > behavior. > > And old-timey HTML elements like <button> and <table> and <fieldset> simply do not support custom display values, other than > for the purposes of answering the very high-level question of "is this > element block-level or inline-level", for flowing other content around > the element.

Also see:

• Flexbug #9: Some HTML elements can't be flex containers
• 10. Some HTML elements can't be grid containers

Here is my simplest hack.

button::before,
button::after {
    content: '';
    flex: 1 0 auto;
}

Starting Chrome 83, the button now works as inline-grid/grid/inline-flex/flex, you can see more about this new feature here

Here is a snippet(for those using Chrome 83 and up)

button {
  display: inline-flex;
  height: 2rem;
  align-items: flex-end;
  width: 4rem;
  -webkit-appearance: none;
  justify-content: flex-end;
}

<!-- 

The align-items keyword should fail in Chrome 81 or earlier, but work in Chrome 83 or later. To see the error, the button needs styles that make it more of an extrinsic container. In other words, it needs a height or width set. 
 
-->
<button>Hi</button>
<input type="button" value="Hi">