Flickering div when using CSS transform on hover - html

Question

I'm making a div on top of the tweet (and also the Facebook like) button. I want it to move up as soon as I hover above the div (button) so you can actually press the real tweet button. I've tried the following.
HTML:
<div class="tweet-bttn">Tweet</div>
<div class="tweet-widget">
Tweet
<script>!function(d,s,id){var js,fjs=d.getElementsByTagName(s)[0],p=/^http:/.test(d.location)?'http':'https';if(!d.getElementById(id)){js=d.createElement(s);js.id=id;js.src=p+'://platform.twitter.com/widgets.js';fjs.parentNode.insertBefore(js,fjs);}}(document, 'script', 'twitter-wjs');</script>
</div>
CSS:
.tweet-bttn{
position: relative;
top: -30px;
left: -10px;
display:block;
opacity: 1;
width: 80px;
padding: 10px 12px;
margin:0px;
z-index:3;}
.tweet-bttn:hover{
-webkit-animation-name: UpTweet;
-moz-animation-name: UpTweet;
-o-animation-name: UpTweet;
animation-name: UpTweet;
-webkit-animation-duration:.5s;
-moz-animation-duration:.5s;
animation-duration:.5s;
-webkit-transition: -webkit-transform 200ms ease-in-out;
-moz-transition: -moz-transform 200ms ease-in-out;
-o-transition: -o-transform 200ms ease-in-out;
transition: transform 200ms ease-in-out;}
#-webkit-keyframes UpTweet {
0% {
-webkit-transform: translateY(0);
}
80% {
-webkit-transform: translateY(-55px);
}
90% {
-webkit-transform: translateY(-47px);
}
100% {
-webkit-transform: translateY(-50px);
}
... and all other browser pre-fixes.
}
I'm not sure what's going wrong. It looks like that as soon as I hover, it moves, but if I move the cursor one more pixel, it has to do a new calculation which causes the flickering.

Answer 1

I don't know why you need animations for this when you can simply achieve the above using transitions
The trick is to move the child element on parent hover
Demo
div {
margin: 100px;
position: relative;
border: 1px solid #aaa;
height: 30px;
}
div span {
position: absolute;
left: 0;
width: 100px;
background: #fff;
top: 0;
-moz-transition: all 1s;
-webkit-transition: all 1s;
transition: all 1s;
}
div span:nth-of-type(1) {
/* Just to be sure the element stays above the
content to be revealed */
z-index: 1;
}
div:hover span:nth-of-type(1) { /* Move span on parent hover */
top: -40px;
}
Explanation: Firstly we wrap span's inside a div element which is position: relative;
and later we use transition on span which will help us to smooth the flow of the animation, now we use position: absolute; with left: 0;, this will stack elements on one another, than we use z-index to make sure the first element overlays the second.
Now at last, we move the first span, we select that by using nth-of-type(1), which is nothing but first child of it's kind which is nested inside div, and we assign top: -40px; which will transit when the parent div is hovered.