An iframe perfectly centered both horizontally and vertically, featuring a 16:9 aspect ratio and utilizing the maximum screen space without any cropping

Question

An iframe perfectly centered both horizontally and vertically, featuring a 16:9 aspect ratio and utilizing the maximum screen space without any cropping

Specifications:

It is mandatory for the iframe to be enclosed within a div container as shown in the code below.
The container should have the flexibility to adjust to any valid width and height using the vw and vh viewport units. Check the code provided below.
The width and height must be defined in vw and vh units.
The static video preview image should not be cropped at any cost.
Avoid black bars above and below the static video preview image (letterboxing).
No black bars on the sides of the static video preview image (pillarboxing) either.
Utilize maximum space inside the containing div for the static video preview image.
Maintain a constant aspect ratio of 16:9 for the static video preview image.
Prevent the appearance of scrollbars.
Center the static video preview image both vertically and horizontally inside its containing div.
Implement Responsive Web Design principles.

All the above requirements should be met when resizing the browser or viewport.

HTML:

<div class="container">
   <iframe></iframe>
</div>

CSS:

.container {
   width:90vw;
   height:50vh;
}

javascript html css iframe responsive-design

Answer 1

Answer №1

Using the same method without any additional markup to maintain the aspect ratio.

Visit JsFiddle for the code without unnecessary comments.

<!DOCTYPE html><html lang="en"><head><meta charset="utf-8">
<title>Centered Iframe Inside Container</title>
<meta name="generator" content="PSPad editor, www.pspad.com">
<style>
.container {
    display:table-cell; /* (specs: omitted table parts, the browser will insert mandatory elements in the dom tree) */
    position:relative;
    padding:; /* optional, margins ignored */
    width:100vw; /* any value */
    height:1vh; /* will expand by the :before element */
    overflow:hidden; /* hide eventual black bars */
    background:tan; /* bg-colors just for demo testing */
    vertical-align:middle;
    text-align:center;
}
.container:before {
    display:block;
    padding-top:56%; /* keeps the 16/9 ratio for the AP */
    height:0;
    background:red;
    content:"\a0";
}
.container iframe {
    position:absolute; /* to be ratio consistent */
    top:-.5%;
    left:-.5%; /* overflow eventual black bars */
    border:0;
    width:101%; /* grow some to avoid thinner black bars */
    height:101%;
    overflow:hidden; /* for html5 browsers the html attribute is depreciated */
    background:gold;
}
</style>
</head><body>

<div class="container">
    <iframe scrolling="no" src=""></iframe>
</div>

</body></html>

Answer 2

Using the same method without any additional markup to maintain the aspect ratio.

Visit JsFiddle for the code without unnecessary comments.

<!DOCTYPE html><html lang="en"><head><meta charset="utf-8">
<title>Centered Iframe Inside Container</title>
<meta name="generator" content="PSPad editor, www.pspad.com">
<style>
.container {
    display:table-cell; /* (specs: omitted table parts, the browser will insert mandatory elements in the dom tree) */
    position:relative;
    padding:; /* optional, margins ignored */
    width:100vw; /* any value */
    height:1vh; /* will expand by the :before element */
    overflow:hidden; /* hide eventual black bars */
    background:tan; /* bg-colors just for demo testing */
    vertical-align:middle;
    text-align:center;
}
.container:before {
    display:block;
    padding-top:56%; /* keeps the 16/9 ratio for the AP */
    height:0;
    background:red;
    content:"\a0";
}
.container iframe {
    position:absolute; /* to be ratio consistent */
    top:-.5%;
    left:-.5%; /* overflow eventual black bars */
    border:0;
    width:101%; /* grow some to avoid thinner black bars */
    height:101%;
    overflow:hidden; /* for html5 browsers the html attribute is depreciated */
    background:gold;
}
</style>
</head><body>

<div class="container">
    <iframe scrolling="no" src=""></iframe>
</div>

</body></html>

Answer 3

Answer №2

By harnessing the power of JavaScript, you have the ability to listen for the resize event. This event triggers whenever the window of a browser changes its shape. Utilizing some basic algebraic calculations, you can determine the dimensions of an iframe based on the dimensions of its container. Dive into this demonstration that showcases all the necessary steps.

"use strict";

var container = document.querySelector('.container');
var frame = container.querySelector('iframe');

function resizeVideo() {
frame.width = frame.height = 0;

var width = container.offsetWidth;
var height = container.offsetHeight;

if (height * (16 / 9) <= width) {
frame.height = height;
frame.width = height * (16 / 9);
} else {
frame.width = width;
frame.height = width * (9 / 16);
}
}

window.addEventListener('load', resizeVideo);
window.addEventListener('resize', resizeVideo);

.container {
width: 90vw;
height: 50vh;

display: table-cell;
text-align: center;
vertical-align: middle;
}

<div class="container">
<iframe src="https://www.youtube.com/embed/BKhZvubRYy8" frameborder="0" allowfullscreen></iframe>
</div>

Answer 4

By harnessing the power of JavaScript, you have the ability to listen for the resize event. This event triggers whenever the window of a browser changes its shape. Utilizing some basic algebraic calculations, you can determine the dimensions of an iframe based on the dimensions of its container. Dive into this demonstration that showcases all the necessary steps.

"use strict";

var container = document.querySelector('.container');
var frame = container.querySelector('iframe');

function resizeVideo() {
frame.width = frame.height = 0;

var width = container.offsetWidth;
var height = container.offsetHeight;

if (height * (16 / 9) <= width) {
frame.height = height;
frame.width = height * (16 / 9);
} else {
frame.width = width;
frame.height = width * (9 / 16);
}
}

window.addEventListener('load', resizeVideo);
window.addEventListener('resize', resizeVideo);

.container {
width: 90vw;
height: 50vh;

display: table-cell;
text-align: center;
vertical-align: middle;
}

<div class="container">
<iframe src="https://www.youtube.com/embed/BKhZvubRYy8" frameborder="0" allowfullscreen></iframe>
</div>

Answer 5

Answer №3

To achieve a responsive design, consider implementing the following CSS:

.container, iframe {
  width:100%;
  height:auto;
}

Answer 6

To achieve a responsive design, consider implementing the following CSS:

.container, iframe {
  width:100%;
  height:auto;
}

Answer 7

Answer №4

.box {
    width:90vw;
    height:50vh;
}
.box iframe {
    width: 100%;
    height: 100%;
}

This solution seems to be very effective as shown in this live demo https://jsfiddle.net/1q10L7hj/

Answer 8

.box {
    width:90vw;
    height:50vh;
}
.box iframe {
    width: 100%;
    height: 100%;
}

This solution seems to be very effective as shown in this live demo https://jsfiddle.net/1q10L7hj/

Answer 9

Answer №5

Have you considered using the calc method to effortlessly achieve the desired aspect ratio width?

HTML

<div class="container">
    <iframe src="" frameborder="0"></iframe>
</div>

SCSS

<style>

$width = 80vw;

.container {
    width: $width;
    height: calc(($width/16) * 9);
    position: relative;
}
iframe {
    position: absolute;
    width: 100%;
    height: 100%;
    top: 50%;
    left: 50%;
    -webkit-transform: translate(+50%, -50%);
    transform: translate(+50%, -50%);
}

</style>

This way, you can easily adjust the width and apply different positioning styles to the container div without affecting the iframe's aspect ratio.

Answer 10

Have you considered using the calc method to effortlessly achieve the desired aspect ratio width?

HTML

<div class="container">
    <iframe src="" frameborder="0"></iframe>
</div>

SCSS

<style>

$width = 80vw;

.container {
    width: $width;
    height: calc(($width/16) * 9);
    position: relative;
}
iframe {
    position: absolute;
    width: 100%;
    height: 100%;
    top: 50%;
    left: 50%;
    -webkit-transform: translate(+50%, -50%);
    transform: translate(+50%, -50%);
}

</style>

This way, you can easily adjust the width and apply different positioning styles to the container div without affecting the iframe's aspect ratio.

Answer 11

Answer №6

Implementing the table-cell display could be the solution here. By applying it to the container, the iframe becomes the content.

Based on specifications, the browser will automatically insert placeholder elements to ensure proper rendering of the cell, centering the content fully and adjusting its size as needed.

It's worth noting that some requirements may go beyond the scope of your inquiry, especially considering the content loaded within the iframe is not controlled by the parent document. Despite its simplicity, my suggested code aims to meet all possible requirements for the iframe parent while remaining cross-browser friendly.

The issue of black bars and maintaining aspect ratio could still persist in the loaded document. If you have no control over the content being loaded, using the "srcdoc" and "seamless" attributes might be an option, although this would exclude certain browsers like older versions of Internet Explorer.

Check out this JsFiddle for additional insight. I hope the revised code provided below resolves the issue at hand.

In any case, it was a pleasure working on this challenge! Thank you :)

<!DOCTYPE html><html lang="en"><head><meta charset="utf-8">
<title>Fully Container Centred Iframe</title>
<meta name="generator" content="CustomTextGenerator.com">
<style>
.container {
    display:table-cell;
    padding:;
    width:100vw;
    height:20vh;
    background:tan;
    vertical-align:middle;
    text-align:center;
}
.container .ratio{
    display:inline-block;
    position:relative;
    padding-bottom:56%;
    width:100%;
    height:0;
    overflow:hidden;
    vertical-align:middle;
}
.container iframe {
    position:absolute;
    top:-1%;
    left:-1%;
    border:0;
    width:102%;
    height:102%;
    overflow:hidden;
    vertical-align:middle;
}
</style>
</head><body>

<div class="container">
    <div class="ratio">
        <iframe scrolling="no" src=""></iframe>
    </div>
</div>

</body></html>

Answer 12

Implementing the table-cell display could be the solution here. By applying it to the container, the iframe becomes the content.

Based on specifications, the browser will automatically insert placeholder elements to ensure proper rendering of the cell, centering the content fully and adjusting its size as needed.

It's worth noting that some requirements may go beyond the scope of your inquiry, especially considering the content loaded within the iframe is not controlled by the parent document. Despite its simplicity, my suggested code aims to meet all possible requirements for the iframe parent while remaining cross-browser friendly.

The issue of black bars and maintaining aspect ratio could still persist in the loaded document. If you have no control over the content being loaded, using the "srcdoc" and "seamless" attributes might be an option, although this would exclude certain browsers like older versions of Internet Explorer.

Check out this JsFiddle for additional insight. I hope the revised code provided below resolves the issue at hand.

In any case, it was a pleasure working on this challenge! Thank you :)

<!DOCTYPE html><html lang="en"><head><meta charset="utf-8">
<title>Fully Container Centred Iframe</title>
<meta name="generator" content="CustomTextGenerator.com">
<style>
.container {
    display:table-cell;
    padding:;
    width:100vw;
    height:20vh;
    background:tan;
    vertical-align:middle;
    text-align:center;
}
.container .ratio{
    display:inline-block;
    position:relative;
    padding-bottom:56%;
    width:100%;
    height:0;
    overflow:hidden;
    vertical-align:middle;
}
.container iframe {
    position:absolute;
    top:-1%;
    left:-1%;
    border:0;
    width:102%;
    height:102%;
    overflow:hidden;
    vertical-align:middle;
}
</style>
</head><body>

<div class="container">
    <div class="ratio">
        <iframe scrolling="no" src=""></iframe>
    </div>
</div>

</body></html>

Answer 13

Answer №7

I have successfully achieved the desired result by adding an additional div as the parent element of the .container class. A demonstration of this solution can be found on this JSFiddle link, which should work smoothly on Chrome for users on Windows desktop. However, when testing it on Edge and IE11, I encountered a slight issue with the image cover zooming too far out, resulting in an undesired letter-box effect.

Here is the HTML code:

<div id="wrapper">
  <div class="container">
      <iframe scrolling="no" src="https://www.youtube.com/embed/YL9RetC0ook" frameborder="0" allowfullscreen>
      </iframe>
  </div>
</div>

And here is the CSS code:

body {
  margin: 0;
}

#wrapper {
  width: 90vw;
  height: 50vh;
}

.container, iframe {
  width: 100%;
  height: 100%;
}

I cannot guarantee its compatibility with Firefox, so if you are using Firefox, please try it on my JSFiddle link. Nevertheless, this solution should meet the requirements you specified for Chrome users (at least) based on the information provided.

Answer 14

I have successfully achieved the desired result by adding an additional div as the parent element of the .container class. A demonstration of this solution can be found on this JSFiddle link, which should work smoothly on Chrome for users on Windows desktop. However, when testing it on Edge and IE11, I encountered a slight issue with the image cover zooming too far out, resulting in an undesired letter-box effect.

Here is the HTML code:

<div id="wrapper">
  <div class="container">
      <iframe scrolling="no" src="https://www.youtube.com/embed/YL9RetC0ook" frameborder="0" allowfullscreen>
      </iframe>
  </div>
</div>

And here is the CSS code:

body {
  margin: 0;
}

#wrapper {
  width: 90vw;
  height: 50vh;
}

.container, iframe {
  width: 100%;
  height: 100%;
}

I cannot guarantee its compatibility with Firefox, so if you are using Firefox, please try it on my JSFiddle link. Nevertheless, this solution should meet the requirements you specified for Chrome users (at least) based on the information provided.

Answer 15

Answer №8

If you're facing a similar issue, I suggest utilizing a JavaScript window.resize listener for a solution. Unfortunately, I can't provide the actual code right now due to time constraints, but let me lay out an algorithm:

When the window is resized, calculate the width (wW) and height (wH);
Based on wW, determine the container width (cW) (e.g., cW = wW-10 to utilize most of the available width - omit -10 if desired);
Using the computed cW from above, calculate the container height (cH): cH = cW * 9 / 16;
If cH > wH (indicating that the container is too wide vertically), adjust cW based on available window height. In such cases, set cH = wH-10 (to maximize vertical space - omit -10 if needed) and then cW = wH * 16 / 9;
You should now have appropriate values for cW and cH to ensure the container fits within the screen boundaries without any overflow issues. Apply these values accordingly to the container.
For centering the container on the screen, employ position: absolute, left: 50%; top: 50%; in your CSS. Upon updating cW and cH, remember to also update margin-left: -(cW/2); margin-top: -(cH/2);

This outline serves as a guide; feel free to adapt it according to your specific requirements. I trust this information proves useful to you.

Answer 16

If you're facing a similar issue, I suggest utilizing a JavaScript window.resize listener for a solution. Unfortunately, I can't provide the actual code right now due to time constraints, but let me lay out an algorithm:

When the window is resized, calculate the width (wW) and height (wH);
Based on wW, determine the container width (cW) (e.g., cW = wW-10 to utilize most of the available width - omit -10 if desired);
Using the computed cW from above, calculate the container height (cH): cH = cW * 9 / 16;
If cH > wH (indicating that the container is too wide vertically), adjust cW based on available window height. In such cases, set cH = wH-10 (to maximize vertical space - omit -10 if needed) and then cW = wH * 16 / 9;
You should now have appropriate values for cW and cH to ensure the container fits within the screen boundaries without any overflow issues. Apply these values accordingly to the container.
For centering the container on the screen, employ position: absolute, left: 50%; top: 50%; in your CSS. Upon updating cW and cH, remember to also update margin-left: -(cW/2); margin-top: -(cH/2);

This outline serves as a guide; feel free to adapt it according to your specific requirements. I trust this information proves useful to you.

An iframe perfectly centered both horizontally and vertically, featuring a 16:9 aspect ratio and utilizing the maximum screen space without any cropping

Answer №1

Answer №2

Answer №3

Answer №4

Answer №5

Answer №6

Answer №7

Answer №8

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