Using em-unit metrics and choppy CSS transitions on WebKit browsers

I am experimenting with using EMs to specify coordinates and transitioning font-size to display content at different sizes for a block-based graphics project.

Check out this jsfiddle that highlights the issue. It works fine in Firefox, no transition in IE (which is okay), but in Safari and Chrome it has a strange jerky effect.

http://jsfiddle.net/6pf3D/2/

html:

<div class="parent">
    <div class="child">
    </div>
</div>​

css:

.parent{
    -webkit-transition: all;
    -webkit-transition-duration: 10s;
    background-color: rgba(0,255,0,0.3);
    font-size:16px;
    width:16em;
    height:16em;
}
.child{
    background-color: rgba(255,0,0,0.3);
    width: 8em;
    height:8em;
}

javascript:

$('.parent').css('font-size', '32px');

Is there a way to achieve a smooth transition without giving up on using em-based coordinates?

csswebkitcss-transitions

Answer №1

Check out this updated creation I've put together for you

Interactive Demo(2-second Interval)

Demo 2(10-second interval)

CSS Styling:

.parent{
    background-color: rgba(0,255,0,0.3);
    font-size:16px;
    width:16em;
    height:16em;
    transition: width 10s, height 10s;
    -moz-transition: width 10s, height 10s;
    -webkit-transition: width 10s, height 10s;
    -o-transition: width 10s, height 10s;
}

.child{
    background-color: rgba(255,0,0,0.3);
    width: 8em;
    height:8em;
    transition: width 10s, height 10s;
    -moz-transition: width 10s, height 10s;
    -webkit-transition: width 10s, height 10s;
    -o-transition: width 10s, height 10s;
}

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