CSS Media Features - aspect-ratio

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CSS media feature aspect-ratio is used to check the aspect ratio of the viewport or the rendering surface. The aspect ratio is the ratio of the width to the height of a box. This media query allows you to target specific aspect ratios and apply different styles accordingly.

Possible Values

  • ratio − This is the desired ratio of the width to the height in the form of a fractional value or a single integer.

  • min-aspect-ratio − Specifies the minimum aspect ratio for the styles to apply.

  • max-aspect-ratio − Specifies the maximum aspect ratio for the styles to apply.

Syntax

 @media (aspect-ratio: 4/3){ //css-style to be applied }

CSS aspect-ratio - ratio Value

The following example demonstrates use of the aspect-ratio when a ratio value is passed:

  • Here the background color of the div element changes to yellow when the viewport's aspect ratio is equal to 2/2 (at width and height 120).

  • When you move the sliders, the updateSize function is called. This function changes the size of the iframe and updates the labels.

 <html> <head> <style> iframe { display: block; } </style> </head> <body> <label id="labelWidth" for="width">Width:150</label> <input id="width" name="width" type="range" min="120" max="200" step="4" value="150" /> <label id="labelHeight" for="width">Height:150</label> <input id="height" name="height" type="range" min="120" max="200" step="4" value="150" /> <iframe id="block" srcdoc="<style> @media (aspect-ratio: 2/2) { div { background: lightgreen; } } </style><div>To see the effect resize your viewport's width and height.</div>"> </iframe> <script> const updateSize = (size, label) => { block.style[size] = `${eval(size).value}px`; label.textContent = `${size}: ${eval(size).value}`; }; width.oninput = () => updateSize("width", labelWidth); height.oninput = () => updateSize("height", labelHeight); </script> </body> </html>

CSS aspect-ratio - max-aspect-ratio Value

The following example demonstrates how max-aspect-ratio media feature changes the background color of the div element to violet when the viewport's aspect ratio is less than or equal to 3/2 −

 <html> <head> <style> iframe { display: block; } </style> </head> <body> <label id="labelWidth" for="width">Width:150</label> <input id="width" name="width" type="range" min="120" max="200" step="4" value="150" /> <label id="labelHeight" for="width">Height:150</label> <input id="height" name="height" type="range" min="120" max="200" step="4" value="150" /> <iframe id="block" srcdoc="<style> @media (max-aspect-ratio: 3/2) { div { background:violet; } } </style><div>To see the effect resize your viewport's width and height.</div>"> </iframe> <script> const updateSize = (size, label) => { block.style[size] = `${eval(size).value}px`; label.textContent = `${size}: ${eval(size).value}`; }; width.oninput = () => updateSize("width", labelWidth); height.oninput = () => updateSize("height", labelHeight); </script> </body> </html>

CSS aspect-ratio - min-aspect-ratio Value

The following example demonstrates how min-aspect-ratio media feature changes the background color of the div element to yellow when the viewport's aspect ratio is greater than or equal to 4/3 −

 <html> <head> <style> iframe { display: block; } </style> </head> <body> <label id="labelWidth" for="width">Width:150</label> <input id="width" name="width" type="range" min="120" max="200" step="4" value="150" /> <label id="labelHeight" for="width">Height:150</label> <input id="height" name="height" type="range" min="120" max="200" step="4" value="150" /> <iframe id="block" srcdoc="<style> @media (min-aspect-ratio: 4/3) { div { background: yellow; } } </style><div>To see the effect resize your viewport's width and height.</div>"> </iframe> <script> const updateSize = (size, label) => { block.style[size] = `${eval(size).value}px`; label.textContent = `${size}: ${eval(size).value}`; }; width.oninput = () => updateSize("width", labelWidth); height.oninput = () => updateSize("height", labelHeight); </script> </body> </html>
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