I am looking for a way to do a full width (but not full height) HTML5 video.
Something like what the background-cover CSS for images would let me do.
Example:
http://photohack.rs.af.cm
Where the image bar below the header would be replaced with a full width video background.
Width 100% and setting the height do not work, since the video is auto-scaled, and not full width.
Thanks!
In most cases its a simple fix.
video {
max-width: 640px /* cannot exceed this width */
max-height: 390px /* cannot exceed this height */
width: 100% /* 640px or less depending on size of viewport */
height: auto /* automatically calculates height from via above values */
}
Always! Always use percents when dealing with full width videos, responsive design and mobile. The only time it is okay to use pixels is when defining the max-height and max-widthproperties.
Related
I have a div that needs to be full screen width inside a parent div that has a limited with. Simplified, it's something like:
HTML:
<div class="container">
<div class="banner">
</div>
</div>
CSS:
.container {
width: 1170px;
margin: auto;
}
.banner {
width: 100vw;
margin-left: calc( 50% - 50vw);
}
which works fine, except for one thing: The scrollbar on the page covers some of the content in the child div, because 100vw appearantly includes the scrollbar width. So is there a way around this so I can set the width to (100vw - scrollbar width), or perhaps a completely different way to achieve what I want to do with pure CSS?
Try to use % where you can. vw is a percent of the viewport width including the scrollbar and % is a percent of the wrapper object, where the body is not rendered inside the scrollbar.
Don't use a fixed width (px) container. It's bad practice and will not render well on mobile screens. See Responsive Web Design for more.
Don't use vw for containers (or banners). It has weird effects on the scrollbar.
Finally, I don't understand why you want something to be at 300vw or 3x the width of the viewport, but sure. If you designed your page right with responsive web design and avoided setting any wrapper's dimensions with px, then it shouldn't be hard to know what that width of the containing div is. For example, if the wrapper (containing div) is at 30% of the viewport and you want your banner to be 300% of the viewport, then you want 1000% for your banner to span the width of three screens.
You could set the scrollbar width and subtract it from the container's width using 'pure CSS'.
You could give width to the scroll bar in webkit-browsers using:
body::-webkit-scrollbar {
width: scrollbarwidthpx;
}
and set the content width as:
width: calc(100vw - scrollbarwidthpx);
You could make use of this article regarding customizing scrollbar
I can't get this simple slideshow to re-size correctly. When I shrink down the window, the image width compresses, but the height does not, and I want the height/width ratio to remain the same as the viewport shrinks. I know the fault lies somewhere in my CSS, and but I can't track down the issue. Any help appreciated.
Just use height: auto
.slides img {
height: auto;
/* Rest of you code */
}
How do I set the height of a div container for example that should be 60% of the screen height?
Setting the 60% as the height in css works fine if the browser window is not resized. But if I shrink the browser window, the div shrinks accordingly.
https://zurb.com provides a nice example. The "Mission Accomplished", grey part is always the same height, no matter how the browser window is being resized. How can this be ensured?
I don't want to use px to ensure HiDpi support.
Thanks,
That's a simple fixed-height element; it has nothing to do with screen size.
You should just use px and not worry about anything; px means logical pixels and will work with arbitrary DPIs.
While the page in question simply used a fixed height (px) for the element in question, meaning that it will always have the same height (and won't be 60% of the height regardless of viewport height). In order to have an element be relative to the viewport, you're looking for viewport-sized typography.
To adjust based on height, you're looking for the CSS unit vh, which tells the element in question to scale based on the viewport height. You can also use vw to scale based on the viewport width.
Keep in mind that <body> has a default of margin: 8px, so if you want to avoid scrollbars when using viewport-sized typography, you'll also need to override this back to 0.
body {
margin: 0;
}
div {
height: 60vh;
width: 100vw;
background: red;
}
<div></div>
For more in-depth information on CSS units, I'd recommend checking out this guide.
Hope this helps! :)
I have an image which I'd like to scale according to the following rules with increasing importance:
normally has a width of 38% (of the parent/screen);
not become smaller than 300px;
never become larger than 100% (of the parent/screen) (only an issue if the parent/screen is smaller than 300px;
That is to say: the image takes only a percentage of the available space but should not become too small on smaller screens. However, for very small screens (mobile devices), the image may never exceed the full width of the available space, even if this would mean it shrinks below the minimum width.
I thought I could do this with the following css:
img {
width: 38%;
min-width: 300px;
max-width: 100%;
}
thinking that the max-width would take preceedence over the min-width because it appears later. But it is not working... The image appears as the required percentage and is not shrinking below 300px. However, on a small screen (<300px), the image extends out of the screen (scrollbars appear).
Reading the docs, min-width overrides max-width, so I should have seen this coming...
One obvious solution would be to add a media query:
#media screen and (max-width: 300px) {
img {
min-width: 0;
width: 100%;
}
}
However, I would like to be able to override the width specifics (i.e. the 38% or the 300px values) from within the html (tag style).
Several questions on SO touch on the topic of sizing, but I could not find one about my exact case. Anyone here with a solution/suggestion?
Some side requirements:
should work in major browsers, html5/css3
no javascript (if it turns out that it's not possible with css only, I will create a js solution, but I prefer no js for this)
no media queries (see above)
I am in control of the html, so nesting inside additional elements is fine if needed
If min-width overrides max-width, then the solution is to not set min-width to a value that can become greater than the window width.
In other words, swap around the values for width and min-width. Then you won't need media queries or JavaScript.
img {
width:300px;
min-width:38%;
max-width:100%;
}
<p><img src="https://via.placeholder.com/999x333"/></p>
<p><img src="https://via.placeholder.com/999x333" style="width:400px"/></p>
In this example, both images are never smaller than 38% and never larger than 100% of the window, and the first image prefers 300px while the second one prefers 400px.
(Note that the images themselves say they are "999×333"; you should ignore that.)
I have a video element set to 100% width in a container div. That div has a max-width of 800px and min-width of 400px. When resizing the browser I need the video element to resize while retaining its original aspect ratio. Currently it resizes in width but remains its original height, adding letterbox bars above and below to make up for it.
Is it possible to resize the video element dynamically like this without resorting to Javascript?
According to the box model, in the section on replaced elements, this should work as you expect: Since the video has a height of auto and a set width, and it has an intrinstic ratio (as videos do), then the used value of height should be computed based on those. Make sure you are not specifying the height anywhere — the following CSS worked for me:
video {
width: 100%;
}
div {
max-width: 800px;
min-width: 400px;
}
Try explicitly adding height: auto to the video — maybe with !important to see if it’s getting set somewhere else.