Css z-index 丢失后，webkit 转换 tranate3d

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Waiting to see the example

Have you tried to do a transform scale(1)? I remember to had a similar problem, and I had to re-arrange the html order of elements, and utilise a transform that I didn't need it just because the z-index of the use of transform changed.

If I am not in error, every time that you use a transform, it become the highest z-index available, and it is ordered by the nearest element of html is to the start of the tag. So from up to below.

I hope that this help

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I haven't been able to reproduce the problem you describe here. Regardless of what I do, the z-index value is retained throughout all transforms. I'm testing using Chromium (Google Chrome).

The third argument of the translate3d function manipulates the z-axis of the element. The concept is similar to, but not exactly the same as, the z-index... Elements with a lower z-axis are under elements with a higher value.

I know you tried values of the third argument to match your intended z-index, but the problem is that the z-axis doesn't seem to change during CSS3 animation. In the following example, the hovered element should be on top, but #element_a stays on top.

If I add a z-index to both the regular selector and the :hover selector, it seems to work and allow the hovered element to be top-most.

Although it's not exactly what you were looking for, this behavior provides a solution. You just need to use translate3d and z-index to set the order for the initial rendering.

<style>
div {
width: 300px;
height: 150px;
background-color: white;
border: 5px outset gray;
float: left;
margin: 20px;
-webkit-transition: 2s;
}


#element_a {
-webkit-transform: translate3d(0, 0, 50px);
}
#element_b {
-webkit-transform: translate3d(0, 0, 100px);
}


#element_a:hover {
-webkit-transform: translate3d(100px, 0, 60px);
}


#element_b:hover {
-webkit-transform: translate3d(-100px, 0, -60px);
}
</style>
<body>
<div id="element_a">
<img src="http://www.google.com/intl/en_com/images/srpr/logo3w.png">
</div>
<div id="element_b">
<img src="http://www.google.com/intl/en_com/images/srpr/logo3w.png">
</div>
</body>

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最佳答案

This might be related to: https://bugs.webkit.org/show_bug.cgi?id=61824

Basically when you apply a 3D transform on the z-axis, the z-index can't be accounted for anymore (you're now in a 3 dimensional rendering plane, use different z-values). If you want to switch back to 2D rendering for child elements, use transform-style: flat;.

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This is most definitely related to the bug noted by samy-delux. This should only affect any elements which are positioned as absolute or relative. In order to remedy the issue, you can apply the following css statement to every element which is positioned this way and is causing issues:

-webkit-transform: translate3d(0,0,0);

This will apply the transform to the element without actually doing a transformation, but affecting its render order so it is above the element causing the issue.

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z-index will work against 3d transformed divs if you style the stackable element with -webkit-transform: translateZ(0px);

Snippet on codepen -> http://codepen.io/mrmoje/pen/yLIul

In the example, the buttons stack up and stack down raise and lower the footer's z-index (+/-1) against the rotated element (an img in this case).

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Bit Late to this but try putting on the elements that have lost their Z-index placing the following, I had an issue when doing some parallax stuff recently and this helped massively.

transform-style: preserve-3d;

This saves putting

transform: translate3d(0,0,0);

On other elements which puts more strain on the GPU

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Another way around this is that you can create a parent element and apply all other transitions related to it:

# Apply transitions to a parent div
<div>
# This image z-index -1
<img src="foo"/>


# This image z-index -3
<img src="bar"/>


#This image z-index -2
<img src="gg"/>
</div>

JsFiddle

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I had this problem on iphone/ios where I had a dropdown menu that overlapped a leafletjs map but was being covered by the map. Noticed that the map had translate3d applied.

Added this to the dropdown element:

transform: translate3d(0,0,0);

...and it is fixed. Thank you stackoverflow people.