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onload and once the document is loaded remove the class to trigger all transition on all elements as specified in your css. Here is a reverse solution: Make your html layout and set the css accordingly to your final result (with all the transformation you want). Set the transition property to your liking.
To make the transition occur, you must specify at least two things — the name of the CSS property to which you want to apply the transition effect using the transition-property CSS property, and the duration of the transition effect (greater than 0) using the transition-duration CSS property.
In the CSS, use the @keyframes rule paired with fadeIn. At 0%, set the opacity to 0. At 100%, set the opacity to 1. This creates the fade-in effect.
You can run a CSS animation on page load without using any JavaScript; you just have to use CSS3 Keyframes.
Here's a demonstration of a navigation menu sliding into place using CSS3 only:
@keyframes slideInFromLeft {
0% {
transform: translateX(-100%);
}
100% {
transform: translateX(0);
}
}
header {
/* This section calls the slideInFromLeft animation we defined above */
animation: 1s ease-out 0s 1 slideInFromLeft;
background: #333;
padding: 30px;
}
/* Added for aesthetics */ body {margin: 0;font-family: "Segoe UI", Arial, Helvetica, Sans Serif;} a {text-decoration: none; display: inline-block; margin-right: 10px; color:#fff;}<header>
<a href="#">Home</a>
<a href="#">About</a>
<a href="#">Products</a>
<a href="#">Contact</a>
</header>The important parts here are the keyframe animation which we call slideInFromLeft...
@keyframes slideInFromLeft {
0% {
transform: translateX(-100%);
}
100% {
transform: translateX(0);
}
}
...which basically says "at the start, the header will be off the left hand edge of the screen by its full width and at the end will be in place".
The second part is calling that slideInFromLeft animation:
animation: 1s ease-out 0s 1 slideInFromLeft;
Above is the shorthand version but here is the verbose version for clarity:
animation-duration: 1s; /* the duration of the animation */
animation-timing-function: ease-out; /* how the animation will behave */
animation-delay: 0s; /* how long to delay the animation from starting */
animation-iteration-count: 1; /* how many times the animation will play */
animation-name: slideInFromLeft; /* the name of the animation we defined above */
You can do all sorts of interesting things, like sliding in content, or drawing attention to areas.
Here's what W3C has to say.
Very little Javascript is necessary:
window.onload = function() {
document.body.className += " loaded";
}
Now the CSS:
.fadein {
opacity: 0;
-moz-transition: opacity 1.5s;
-webkit-transition: opacity 1.5s;
-o-transition: opacity 1.5s;
transition: opacity 1.5s;
}
body.loaded .fadein {
opacity: 1;
}
I know the question said "without Javascript", but I think it's worth pointing out that there is an easy solution involving one line of Javascript.
It could even be inline Javascript, something like that:
<body onload="document.body.className += ' loaded';" class="fadein">
That's all the JavaScript that's needed.
I think I have found a sort of work around for the OP question - instead of a transition beginning 'on.load' of the page - I found that using an animation for an opacity fade in had the same effect, (I was looking for the same thing as OP).
So I wanted to have the body text fade in from white(same as site background) to black text colour on page load - and I've only been coding since Monday so I was looking for an 'on.load' style thing code, but don't know JS yet - so here is my code that worked well for me.
#main p {
animation: fadein 2s;
}
@keyframes fadein {
from { opacity: 0}
to { opacity: 1}
}
And for whatever reason, this doesn't work for .class only #id's(at least not on mine)
Hope this helps - as I know this site helps me a lot!
Well, this is a tricky one.
The answer is "not really".
CSS isn't a functional layer. It doesn't have any awareness of what happens or when. It's used simply to add a presentational layer to different "flags" (classes, ids, states).
By default, CSS/DOM does not provide any kind of "on load" state for CSS to use. If you wanted/were able to use JavaScript, you'd allocate a class to body or something to activate some CSS.
That being said, you can create a hack for that. I'll give an example here, but it may or may not be applicable to your situation.
We're operating on the assumption that "close" is "good enough":
<html>
<head>
<!-- Reference your CSS here... -->
</head>
<body>
<!-- A whole bunch of HTML here... -->
<div class="onLoad">OMG, I've loaded !</div>
</body>
</html>
Here's an excerpt of our CSS stylesheet:
.onLoad
{
-webkit-animation:bounceIn 2s;
}
We're also on the assumption that modern browsers render progressively, so our last element will render last, and so this CSS will be activated last.
CSS only with a delay of 3s
a few points to take here:
Code:
header {
animation: 3s ease-out 0s 1 wait, 0.21s ease-out 3s 1 slideInFromBottom;
}
@keyframes wait {
from { transform: translateY(20px); }
to { transform: translateY(20px); }
}
@keyframes slideInFromBottom {
from { transform: translateY(20px); opacity: 0; }
to { transform: translateY(0); opacity: 1; }
}
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