Animating margins and padding with CSS Transition causes jumpy animation

问题

At my personal website, I'm using the CSS3 Transition property on the top nav to animate the margins and padding of an element with a border, to make the border swell on hover.

Relevant markup:

<nav>
        <a class="email" href="mailto:notmyrealemailaddress">
          <div class="icon-border">
            <img src="images/mail_icon.png" width="14" height="12">
          </div>Email Me</a>

        <a class="phone" href="tel:4075555555">
          <div class="icon-border">
            <img src="images/phone_icon.png" width="11" height="18">
          </div>Call Me</a>

        <a class="behance" href="http://behance.net/dannymcgee" target="_blank">
          <div class="icon-border">
            <img src="images/behance_icon.png" width="21" height="13">
          </div>See My Work</a>
</nav>

CSS:

header nav .icon-border {
  display: inline-block;
  border: 2px solid #000;
  border-radius: 30px;
  padding: 5px;
  margin: 0 10px;
  transition: 0.15s padding ease-out, 0.15s margin ease-out, 0.15s border ease-out;
}

header nav a:hover .icon-border {
  padding: 10px;
  margin: -10px 5px;
  border: 2px solid #ddd;
  transition: 0.15s padding ease-out, 0.15s margin ease-out, 0.15s border ease-out;
}

See what it's doing? By decreasing the margins and increasing the padding on hover, the circular border effectively gets bigger without altering the position of the image it's wrapped around.

It works pretty well, but the problem is that if I quickly move the mouse from EMAIL ME to CALL ME and vice versa, before the first animation completes, the whole nav "jumps" up and down by about a pixel. However, this issue doesn't happen between CALL ME and SEE MY WORK, which leads me to believe it's an issue that can be fixed. Any ideas?

回答1:

I believe the issue is because you are transitioning the margins (and using negative margins which is always a little wonky).

A smoother solution might be using transform: scale(x)

someting like:

header nav .icon-border {
  display: inline-block;
  border: 2px solid #000;
  border-radius: 30px;
  padding: 5px;
  margin: 0 10px;
  transform: scale(1); /* you need a scale here to allow it to transition in both directions */
  transition: 0.15s all ease;
}

header nav a:hover .icon-border {
  transform: scale(1.2);
  border: 2px solid #ddd;
}

回答2:

Maybe this works:

header nav a {
  display: inline-block;
}

来源：https://stackoverflow.com/questions/28203411/animating-margins-and-padding-with-css-transition-causes-jumpy-animation

标签

css

html5

css3

css-transitions