Adjust the iFrame's CSS width to 100% to mimic the scale of an image

Question

Adjust the iFrame's CSS width to 100% to mimic the scale of an image

I am attempting to apply CSS to scale an iFrame by setting width: 100%, while also having the height adjust proportionally to the width.

This resizing technique works perfectly with an <img> tag.

Both the image and the iFrame have their width and height specified in the HTML.

Here are some examples:

<html>
    <style>
        #a{ width: 500px; }
        img{ width: 100%; height: auto }
    </style>
    <body>
        <div id="a">
            <img src="http://lorempixel.com/200/150/" width="200" height="150" />
        </div>
    </body>

While this method works well for images, I am looking to achieve the same effect with iFrames:

<html>
    <style>
        #a{ width: 900px; background: grey;}
        iframe{ width: 100%; height: auto }
    </style>
    <body>
        <div id="a">
            <iframe width="560" height="315" src="http://www.youtube.com/embed/RksyMaJiD8Y" frameborder="0" allowfullscreen></iframe>
        </div>
    </body>

Although the iFrame expands to be 100% wide, it does not adjust its height proportionally like the image does.

css iframe responsive-design

Answer 1

Answer №1

One key distinction between an image and an iframe is that an image maintains its aspect ratio, while combining the two can result in a responsive iframe.

If you're curious, check out this link for an example: http://jsfiddle.net/Masau/7WRHM/

Here's the HTML:

<div class="wrapper">
    <div class="h_iframe">
        <!-- a transparent image is preferable -->
        <img class="ratio" src="http://placehold.it/16x9"/>
        <iframe src="http://www.youtube.com/embed/WsFWhL4Y84Y" frameborder="0" allowfullscreen></iframe>
    </div>
    <p>Please scale the "result" window to notice the effect.</p>
</div>

CSS:

html,body        {height:100%;}
.wrapper         {width:80%;height:100%;margin:0 auto;background:#CCC}
.h_iframe        {position:relative;}
.h_iframe .ratio {display:block;width:100%;height:auto;}
.h_iframe iframe {position:absolute;top:0;left:0;width:100%; height:100%;}

Just keep in mind that this method only works with a fixed aspect ratio.

Answer 2

One key distinction between an image and an iframe is that an image maintains its aspect ratio, while combining the two can result in a responsive iframe.

If you're curious, check out this link for an example: http://jsfiddle.net/Masau/7WRHM/

Here's the HTML:

<div class="wrapper">
    <div class="h_iframe">
        <!-- a transparent image is preferable -->
        <img class="ratio" src="http://placehold.it/16x9"/>
        <iframe src="http://www.youtube.com/embed/WsFWhL4Y84Y" frameborder="0" allowfullscreen></iframe>
    </div>
    <p>Please scale the "result" window to notice the effect.</p>
</div>

CSS:

html,body        {height:100%;}
.wrapper         {width:80%;height:100%;margin:0 auto;background:#CCC}
.h_iframe        {position:relative;}
.h_iframe .ratio {display:block;width:100%;height:auto;}
.h_iframe iframe {position:absolute;top:0;left:0;width:100%; height:100%;}

Just keep in mind that this method only works with a fixed aspect ratio.

Answer 3

Answer №2

This method seems more organized and efficient. It functions well with inline properties like height and width (I inserted arbitrary values in the fiddle as proof) as well as with the CSS max-width property.

Markup:

<div class="wrapper">
    <div class="h_iframe">
        <iframe height="2" width="2" src="http://www.youtube.com/embed/WsFWhL4Y84Y" frameborder="0" allowfullscreen></iframe>
    </div>
    <p>Adjust the size of the "result" window to observe the effect.</p>
</div>

CSS:

html,body        {height: 100%;}
.wrapper         {width: 80%; max-width: 600px; height: 100%; margin: 0 auto; background: #CCC}
.h_iframe        {position: relative; padding-top: 56%;}
.h_iframe iframe {position: absolute; top: 0; left: 0; width: 100%; height: 100%;}

http://jsfiddle.net/7WRHM/1001/

Answer 4

This method seems more organized and efficient. It functions well with inline properties like height and width (I inserted arbitrary values in the fiddle as proof) as well as with the CSS max-width property.

Markup:

<div class="wrapper">
    <div class="h_iframe">
        <iframe height="2" width="2" src="http://www.youtube.com/embed/WsFWhL4Y84Y" frameborder="0" allowfullscreen></iframe>
    </div>
    <p>Adjust the size of the "result" window to observe the effect.</p>
</div>

CSS:

html,body        {height: 100%;}
.wrapper         {width: 80%; max-width: 600px; height: 100%; margin: 0 auto; background: #CCC}
.h_iframe        {position: relative; padding-top: 56%;}
.h_iframe iframe {position: absolute; top: 0; left: 0; width: 100%; height: 100%;}

http://jsfiddle.net/7WRHM/1001/

Answer 5

Answer №3

This method is my favorite. It's straightforward, adaptable, and works on different screen sizes. The concept involves creating an outer div with zero height and setting the bottom padding to match the video's aspect ratio. By scaling the iframe to 100% width and height, it fills the entire outer container. As a result, the outer container adjusts its height based on the width, and the iframe inside resizes accordingly.

<div style="position:relative; width:100%; height:0px; padding-bottom:56.25%;">
    <iframe style="position:absolute; left:0; top:0; width:100%; height:100%"
        src="http://www.youtube.com/embed/RksyMaJiD8Y">
    </iframe>
</div>

The key factor to change here is the padding-bottom value in the outer div. It should be 75% for videos in 4:3 aspect ratio, and 56.25% for widescreen videos in 16:9 aspect ratio.

Answer 6

This method is my favorite. It's straightforward, adaptable, and works on different screen sizes. The concept involves creating an outer div with zero height and setting the bottom padding to match the video's aspect ratio. By scaling the iframe to 100% width and height, it fills the entire outer container. As a result, the outer container adjusts its height based on the width, and the iframe inside resizes accordingly.

<div style="position:relative; width:100%; height:0px; padding-bottom:56.25%;">
    <iframe style="position:absolute; left:0; top:0; width:100%; height:100%"
        src="http://www.youtube.com/embed/RksyMaJiD8Y">
    </iframe>
</div>

The key factor to change here is the padding-bottom value in the outer div. It should be 75% for videos in 4:3 aspect ratio, and 56.25% for widescreen videos in 16:9 aspect ratio.

Answer 7

Answer №4

You have the option to utilize viewport units in place of %. Here's an example:

iframe {
    max-width: 100vw;
    max-height: 56.25vw; /* maintaining height/width ratio = 315/560 = .5625 */
}

DEMO (Try resizing to see the impact)

body {
  margin: 0;
}
.a {
  max-width: 560px;
  background: grey;
}
img {
  width: 100%;
  height: auto
}
iframe {
  max-width: 100vw;
  max-height: 56.25vw;
  /* height/width ratio = 315/560 = .5625 */
}

<div class="a">
  <img src="http://lorempixel.com/560/315/" width="560" height="315" />
</div>

<div class="a">
  <iframe width="560" height="315" src="http://www.youtube.com/embed/RksyMaJiD8Y" frameborder="0" allowfullscreen></iframe>
</div>

Answer 8

You have the option to utilize viewport units in place of %. Here's an example:

iframe {
    max-width: 100vw;
    max-height: 56.25vw; /* maintaining height/width ratio = 315/560 = .5625 */
}

DEMO (Try resizing to see the impact)

body {
  margin: 0;
}
.a {
  max-width: 560px;
  background: grey;
}
img {
  width: 100%;
  height: auto
}
iframe {
  max-width: 100vw;
  max-height: 56.25vw;
  /* height/width ratio = 315/560 = .5625 */
}

<div class="a">
  <img src="http://lorempixel.com/560/315/" width="560" height="315" />
</div>

<div class="a">
  <iframe width="560" height="315" src="http://www.youtube.com/embed/RksyMaJiD8Y" frameborder="0" allowfullscreen></iframe>
</div>

Answer 9

Answer №5

@Anachronist seems to have the closest answer, with @Simone not too far behind. One thing to keep in mind when using percentage padding on an element is that it is based on the width of its parent, not its own width. This can lead to incorrect aspect ratios if the element's width differs from its container.

The most foolproof solution is to utilize two wrapping divs:

body {
  /* just for demonstration purposes */
  background: lightgray;
}
.fixed-aspect-wrapper {
  /* can accommodate any padding to match its siblings in the DOM */
  padding: 0;
  /* width can be anything or nothing, it doesn't matter */
  width: 60%;
  max-width: 800px;
}
.fixed-aspect-padder {
  /* this ensures the height of the first wrapper is stretched while maintaining a natural width at the correct ratio */
  height: 0;
  margin: 0;
  width: auto;
  position: relative;
  /* the last padding dimension represents (100 * height / width) of the item to be scaled,
     here we use the common 16:9 ratio */
  padding: 0 0 56.25%;
}
.whatever-needs-the-fixed-aspect {
  /* this fills the available space */
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  border: 0;
  /* just for demonstration purposes */
  background: white;
}

<div class="fixed-aspect-wrapper">
  <div class="fixed-aspect-padder">
    <iframe class="whatever-needs-the-fixed-aspect" src="/"></iframe>
  </div>
</div>

Answer 10

@Anachronist seems to have the closest answer, with @Simone not too far behind. One thing to keep in mind when using percentage padding on an element is that it is based on the width of its parent, not its own width. This can lead to incorrect aspect ratios if the element's width differs from its container.

The most foolproof solution is to utilize two wrapping divs:

body {
  /* just for demonstration purposes */
  background: lightgray;
}
.fixed-aspect-wrapper {
  /* can accommodate any padding to match its siblings in the DOM */
  padding: 0;
  /* width can be anything or nothing, it doesn't matter */
  width: 60%;
  max-width: 800px;
}
.fixed-aspect-padder {
  /* this ensures the height of the first wrapper is stretched while maintaining a natural width at the correct ratio */
  height: 0;
  margin: 0;
  width: auto;
  position: relative;
  /* the last padding dimension represents (100 * height / width) of the item to be scaled,
     here we use the common 16:9 ratio */
  padding: 0 0 56.25%;
}
.whatever-needs-the-fixed-aspect {
  /* this fills the available space */
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  border: 0;
  /* just for demonstration purposes */
  background: white;
}

<div class="fixed-aspect-wrapper">
  <div class="fixed-aspect-padder">
    <iframe class="whatever-needs-the-fixed-aspect" src="/"></iframe>
  </div>
</div>

Answer 11

Answer №6

After struggling to find a solution that would work within a Weebly "add your own html" box, I stumbled upon this amazing fix at that worked like a charm.

Here is the CSS:

.iframe-container {
  overflow: hidden;
  padding-top: 56.25%;
  position: relative;
}

.iframe-container iframe {
   border: 0;
   height: 100%;
   left: 0;
   position: absolute;
   top: 0;
   width: 100%;
}

/* 4x3 Aspect Ratio */
.iframe-container-4x3 {
  padding-top: 75%;
}

And here is the HTML:

<div class="iframe-container">
  <iframe src="https://player.vimeo.com/video/106466360" allowfullscreen></iframe>
</div>

Answer 12

After struggling to find a solution that would work within a Weebly "add your own html" box, I stumbled upon this amazing fix at that worked like a charm.

Here is the CSS:

.iframe-container {
  overflow: hidden;
  padding-top: 56.25%;
  position: relative;
}

.iframe-container iframe {
   border: 0;
   height: 100%;
   left: 0;
   position: absolute;
   top: 0;
   width: 100%;
}

/* 4x3 Aspect Ratio */
.iframe-container-4x3 {
  padding-top: 75%;
}

And here is the HTML:

<div class="iframe-container">
  <iframe src="https://player.vimeo.com/video/106466360" allowfullscreen></iframe>
</div>

Adjust the iFrame's CSS width to 100% to mimic the scale of an image

Answer №1

Answer №2

Answer №3

Answer №4

DEMO (Try resizing to see the impact)

Answer №5

Answer №6

Similar questions

Lumx motion not functioning properly

Tips for showcasing additional choices within a SELECT element while incorporating floating labels and adjusting the size

Aligning div elements in the center alongside one another

Troubleshooting IE compatibility issues with jQuery .hide() method

Attempting to create a dynamic dropdown menu with animated effects triggered by a key press

Split the text on the left side before disrupting the flow on the following line

dotdotdot.js is only functional once the window has been resized

Position the responsive carousel in the center

jquery counter is malfunctioning

The overflow hidden property is failing to conceal the background of the parent element

Looking to modify the CSS of an element during a drop event using interact.js?

Two rectangular divisions placed next to each other, with one perfectly centered and the height of the second division adjusting to match the height of the

Tips for manipulating the DOM: Pushing existing elements when new ones are dynamically created with JavaScript

Tips for displaying and concealing a toggle button based on screen size changes

Has Heroku caused your CSS Stylesheet to fail to load after deployment?

Incorporating Social Share Buttons to Enhance User Engagement on Your WordPress E

What steps can be taken to ensure this website is responsive and includes a countdown counter?

Guide to incorporating vertical scrolling for a grid of items in Material UI

Unable to customize the color of Bootstrap pagination

Issue with Navbar Header: Troubleshooting and Solutions