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HTML

              
                <div class="hero" data-full-height>
	<div class="container">
		<h1>🦸‍♂️ CSS-Only Fix for Full Height Heroes</h1>
		<p>Currently, WebKit-based browsers support <code>-webkit-fill-available</code> for setting the size of an element to the available space in its container.</p>
		<p>This is awesome for solving common height problems, like the classic <a href="https://allthingssmitty.com/2020/05/11/css-fix-for-100vh-in-mobile-webkit/" target="_blank" rel="noopener">100vh issue in mobile WebKit</a>.</p>
		
		<details>
			<summary><strong>But there are still some important gotchas to watch out for…</strong></summary>
			
			<ul>
				<li><strong>Chrome Height Bug</strong>: <a href="https://github.com/postcss/postcss-100vh-fix#readme" target="_blank" rel="noopener">As Sitnick pointed out in his PostCSS plugin</a>, Chrome currently fails to calculate the correct height in some cases (like this pen), so it’s best to use <code>100vh</code> by default and only apply <code>-webkit-fill-available</code> in browsers that need it (e.g., iOS Safari). You can use <code>@supports</code> to work around this for now.</li>
				<li><strong>Safari Orientation Bug</strong>: Unfortunately, iOS Safari incorrectly resets the element height on orientation changes. For example, <a href="https://www.dropbox.com/s/f49gsckvyc6uc3e/2020-08-03%20Safari%20orientation%20bug%20with%20fill-available%20fix%20for%20full%20height%20heroes.mp4?dl=0" target="_blank" rel="noopener">see this screencast</a>. I haven't checked for an official bug report yet, but be careful using this in production in the meantime. YMMV.</li>
				<li><strong>Box Sizing</strong>: As the W3C spec says (see quote below), fit available (aka “stretch fit”) <em>subtracts</em> the current element’s margin/border/padding, so if you have <code>box-sizing: border-box</code> applied you’ll end up shrinking your element by that much. To fix, simply make your element <code>box-sizing: content-box</code>.
					<blockquote>
						<dl>
							<dt><dfn>stretch fit</dfn></dt>
							<dd>The stretch fit into a given size is that size, minus the element’s computed margins (not collapsed, treating <span class="css">auto</span> as zero), border, and padding in the given dimension (such that the outer size is a perfect fit), and flooring at zero (so that the inner size is not negative).
							</dd>
						</dl>
					</blockquote>
				</li>
				<li><strong>Future Keyword</strong>: This fix should help us for a while, but the keyword “fill-available” has changed in the spec, so when it finally lands in browsers as a web standard it will be called “stretch-fit” instead. Don’t worry about it for now, just expect the change later on.</li>
			</ul>
			
			<p>If you’re comfortable with these bugs, here’s some code you can use today:</p>
			<code><pre>.hero {
	min-height: 100vh;
}

<span class="comment">/* Only apply fix in iOS Safari */</span>
@supports (-webkit-touch-callout: none) {
	.hero {
		min-height: -webkit-fill-available;
		<span class="comment">/* Prevent margin/border/padding from shrinking available space */</span>
		box-sizing: content-box;
	}
}</pre></code>
		</details>
		
		<p>P.S. 👋 Shoutout to <a href="https://github.com/postcss/postcss-100vh-fix#readme" target="_blank" rel="noopener">Sitnick’s PostCSS plugin</a> and <a href="https://allthingssmitty.com/2020/05/11/css-fix-for-100vh-in-mobile-webkit/" target="_blank" rel="noopener">Matt Smith’s article</a> for this fix! Huge, huge improvement on the JS hacks we’ve been using for so long. Thank you!</li>
	</div>
</div>

<div class="container" style="margin-bottom: 10rem;">
	<h2>References</h2>
	<ul>
		<li><a href="https://twitter.com/sitnikcode/status/1288097180721377280" target="_blank" rel="noopener">Twitter: Sitnik the Developer: I released a new @PostCSS plugin…</a></li>
		<li><a href="https://github.com/postcss/postcss-100vh-fix#readme" target="_blank" rel="noopener">GitHub: PostCSS 100vh Fix</a></li>
		<li><a href="https://allthingssmitty.com/2020/05/11/css-fix-for-100vh-in-mobile-webkit/" target="_blank" rel="noopener">Matt Smith: CSS fix for 100vh in mobile WebKit</a></li>
		<li><a href="https://caniuse.com/#feat=intrinsic-width" target="_blank" rel="noopener">Can I use… Intrinsic & Extrinsic Sizing</a></li>
		<li><a href="https://github.com/w3c/csswg-drafts/commit/c372e95e1438308623941bb28ef0f5e7e31dffb3" target="_blank" rel="noopener">GitHub: w3c/csswg-drafts: [css-sizing] Rename fill-available sizing to stretch-fit sizing</a></li>
		<li><a href="https://www.w3.org/TR/css-sizing-3/#stretch-fit" target="_blank" rel="noopener">W3C: CSS Intrinsic & Extrinsic Sizing Module Level 3: Terminology: stretch fit</a></li>
	</ul>
</div>

              
            
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CSS

              
                * {
	box-sizing: border-box;
}

body {
	margin: 0;
	line-height: 1.4;
	tab-size: 4;
}

pre {
	border: 1px solid #00f;
	padding: 1rem;
	background: white;
	overflow: auto;
	-webkit-overflow-scroll: touch;
}

/* Use standard viewport units by default */
.hero {
	min-height: 100vh;
	padding: 1rem 0;
	background-color: white;
	background-image: linear-gradient(to bottom, white, #aaf 100vh);
}

/* Only apply fix in iOS Safari */
@supports (-webkit-touch-callout: none) {
	.hero {
		min-height: -webkit-fill-available;
		/* Prevent margin/border/padding from shrinking available space */
		box-sizing: content-box;
	}
}

.hero h1 {
	margin: 0;
}

.hero li {
	margin: 1rem 0;
}

.container {
	display: block;
	width: 100%;
	margin: 0 auto;
	max-width: 42rem;
	padding-left: 1rem;
	padding-right: 1rem;
}

.comment {
	color: #999;
}

              
            
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JS

              
                
              
            
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999px

Console