CSS z-index paradox flower

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遇见更好的自我
遇见更好的自我 2021-01-29 20:20

I would like to create a paradoxical effect via the z-index CSS property.

In my code I have five circles, like in the image below, and they are all absolute

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  • 2021-01-29 20:55

    Here's my go at it.

    I also use a pseudo element positioned on top of the first circle, but rather than using clip, I keep its background transparent and just give it an inset box-shadow that matches the background color of the circles (silver) as well as a red border to cover the bottom right sides of the circle's border.

    Demo

    CSS (that is different from starting point)

    .i1 { 
      position: absolute; top: 30px; left: 0px;
      &:before {
        content: '';
        position: absolute;
        z-index: 100;
        top: 0;
        left: 0;
        width: 50px;
        height: 50px;
        border-radius:  50%;
        box-shadow: inset 5px -5px 0 6px silver;
        border-bottom: solid 1px red;
      }
    }
    

    Final product enter image description here

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  • 2021-01-29 20:56

    Here's my attempt: http://jsfiddle.net/Kx2k5/1/
    (successfully tested on Fx27, Ch33, IE9, Sf5.1.10 and Op19)


    CSS

    .item {
       /* include borders on width and height */  
       -webkit-box-sizing : border-box;
       -moz-box-sizing    : border-box;
       box-sizing         : border-box;
       ...
    }
    
    .i1:after {
       content: "";
    
       /* overlap a circle over circle #1 */
       position : absolute;
       z-index  : 1;
       top      : 0;
       left     : 0;
       height   : 100%;
       width    : 100%;
    
       /* inherit border, background and border-radius */
       background    : inherit;
       border-bottom : inherit;
       border-radius : inherit;
    
       /* only show the bottom area of the pseudoelement */
       clip          : rect(35px 50px 50px 0);
    }
    

    Basically I've overlapped an :after pseudoelement over the first circle (with some properties inherited), then I've clipped it with clip() property, so I only make its bottom section visible (where circle #1 overlaps the circle #5).

    For the CSS properties I've used here, this example should be working even on IE8 (box-sizing, clip(), inherit, and pseudoelements are supported there)


    Screenshot of resulting effect

    enter image description here

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  • 2021-01-29 20:59

    My attempt also using clip. The idea was to have half and half for the div. That way setting z-index would work.

    So you can set the top part to z-index: -1 and the bottom to z-index: 1.

    Outcome:

    enter image description here

    .item {
      width: 50px;
      height: 50px;
      line-height: 50px;
      border: 1px solid red;
      background: silver;
      border-radius: 50%;
      text-align: center;
    }
    .under {
      z-index: -1;
    }
    .above {
      z-index: 1;
      overflow: hidden;
      clip: rect(30px 50px 60px 0);
    }
    .i1 {
      position: absolute;
      top: 30px;
      left: 0px;
    }
    .i2 {
      position: absolute;
      top: 0px;
      left: 35px;
    }
    .i3 {
      position: absolute;
      top: 30px;
      left: 65px;
    }
    .i4 {
      position: absolute;
      top: 70px;
      left: 50px;
    }
    .i5 {
      position: absolute;
      top: 70px;
      left: 15px;
    }
    <div class="item i1 under">1</div>
    <div class="item i1 above">1</div>
    <div class="item i2">2</div>
    <div class="item i3">3</div>
    <div class="item i4">4</div>
    <div class="item i5">5</div>

    DEMO HERE

    Note: Tested on IE 10+, FF 26+,Chrome 33+ and Safari 5.1.7+.

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  • 2021-01-29 21:05

    JS Fiddle

    HTML

    <div class="item i1">1</div>
    <div class="item i2">2</div>
    <div class="item i3">3</div>
    <div class="item i4">4</div>
    <div id="five">5</div>
    <div class="item2 i5"></div>
    <div class="item3 i6"></div>
    

    CSS

    .item {
        width: 50px;
        height: 50px;
        line-height: 50px;
        border: 1px solid red;
        background: silver;
        border-radius: 50%;
        text-align: center;
    }
    .item2 {
          width: 25px;
        height: 50px;
        line-height: 50px;
        border: 1px solid red;
        border-right: none;
        border-radius: 50px 0 0 50px;
        background: silver 50%;
        background-size: 25px;
        text-align: center;   
            z-index: -3;
    }
    .item3 {
        width: 25px;
        height: 50px;
        line-height: 50px;
        border: 1px solid red;
        border-left: none;
        border-radius: 0 50px 50px 0;
        background: silver 50%;
        background-size: 25px;
        text-align: center;    
    }
    .i1 {
        position: absolute;
        top: 30px;
        left: 0px;
    }
    .i2 {
        position: absolute;
        top: 0px;
        left: 35px;
    }
    .i3 {
        position: absolute;
        top: 30px;
        left: 65px;
    }
    .i4 {
        position: absolute;
        top: 70px;
        left: 55px;
    }
    .i5 {
        position: absolute;
        top: 70px;
        left: 15px;
    }
    .i5 {
        position: absolute;
        top: 72px;
        left:19px;
    
    }
    .i6 {
        position: absolute;
        top: 72px;
        left: 44px;
    }
    #five {
         position: absolute;
        top: 88px;
        left: 40px;
        z-index: 100;
    }
    
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  • 2021-01-29 21:12

    JS Fiddle LIVE DEMO

    Works on IE8 too.

    HTML

    <div class="half under"><div class="item i1">1</div></div>
    <div class="half above"><div class="item i1">1</div></div>
    <div class="item i2">2</div>
    <div class="item i3">3</div>
    <div class="item i4">4</div> 
    <div class="item i5">5</div>
    

    CSS

    .item {
        width: 50px;
        height: 50px;
        line-height: 50px;
        border: 1px solid red;
        background: silver;
        border-radius: 50%;
        text-align: center;
    }
    .half {
        position: absolute;
        overflow: hidden;
        width: 52px;
        height: 26px;
        line-height: 52px;
        text-align: center;
    }
    .half.under {
        top: 30px; 
        left: 0px;
        z-index: -1;
        border-radius: 90px 90px 0 0;
    }
    .half.above {
        top: 55px;
        left: 0px;
        z-index: 1;
        border-radius: 0 0 90px 90px;
    }
    .half.above .i1 { margin-top:-50%; }
    .i2 { position: absolute; top: 0px; left: 35px;}
    .i3 { position: absolute; top: 30px; left: 65px;}
    .i4 { position: absolute; top: 70px; left: 50px; }
    .i5 { position: absolute; top: 70px; left: 15px; }
    
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  • 2021-01-29 21:14

    Sadly the following is just a theoretical answer, as for some reason I can't get -webkit-transform-style: preserve-3d; to work (have to be making some obvious mistake, but can't seem to figure it out). Either way, after reading your question I - as with every paradox - wondered why it's only an apparent impossibility, rather than a real one. Another few seconds me realize that in real life the leaves are rotated a bit, thus allowing such a thing to exist. So then I wanted to concoct a simple demonstration of the technique, but without the previous property that's impossible (it gets drawn to the flat parent layer). Either way, here is the base code none the less

    <div class="container">
        <div>
            <div class="i1 leaf">
                <div class="item">1</div>
            </div>
            <div class="i2 leaf">
                <div class="item">2</div>
            </div>
            <div class="i3 leaf">
                <div class="item">3</div>
            </div>
            <div class="i4 leaf">
                <div class="item">4</div>
            </div>
            <div class="i5 leaf">
                <div class="item">5</div>
            </div>
        </div>
    </div>
    

    And the css:

    .i1 {
        -webkit-transform:rotateZ(288deg)
    }
    .i2 {
        -webkit-transform:rotateZ(0deg)
    }
    .i3 {
        -webkit-transform:rotateZ(72deg)
    }
    .i4 {
        -webkit-transform:rotateZ(144deg)
    }
    .i5 {
        -webkit-transform:rotateZ(216deg)
    }
    .leaf { 
        position:absolute;
        left:35px;
        top:35px;
    }
    .leaf > .item {
        -webkit-transform:rotateY(30deg) translateY(35px)
    }
    

    And you can find the full code here.

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