Convert CSS without transforming its contents

Question

I use transforms to make mine <li>below

here are my codes

.tab-nav {
    width: 100%;
    height: 40px;
    margin-top: 100px;
}

.tab-nav-li {
    display: inline-block;
    border: solid 1px gray;
    margin: 0 5px;
    min-width: 170px;
    min-height: 40px;
    line-height: 40px;
    text-align: center;
    border-top-left-radius: 5px;
    border-top-right-radius: 5px;
    transform: perspective(38px) rotateX(2deg);
    transform-origin: bottom;
}

<div class="tab-nav">
    <ul>
        <li class="tab-nav-li">
            <span>The first tab</span>
        </li>
        <li class="tab-nav-li">
            <span>The second tab</span>
        </li>
        <li class="tab-nav-li">
            <span>The third tab</span>
        </li>
    </ul>
</div>

Run code

Tags

li are transformed as my expectations, but its contents also transformed, and this creates blurry text (as you can see, this is not clear). Is there any way to avoid this?

Another issue considering this in the FF browser, the left border looks nonsmooth. Do you know why and how to solve this problem?

Regards, Ken

---

Updated May 9, 2017 - 17:19

I want to add a call to the "highlighted" class to fill in the background color for the li tag.

.tab-nav {
  width: 100%;
  height: 40px;
  margin-top: 100px;
}

.tab-nav-li {
  display: inline-block;
  margin: 0 5px;
  min-width: 170px;
  min-height: 40px;
  line-height: 40px;
  perspective: 38px; /*Declaring here*/
  position: relative;
}

.tab-nav-li:before {
  content: "";
  width: 100%;
  height: 40px;
  position: absolute;
  border: solid 1px gray;
  border-top-left-radius: 5px;
  border-top-right-radius: 5px;
  transform: rotateX(2deg);/*Then rotate*/
  transform-origin: bottom;
}

span {
  display: block;
  text-align: center;
}

.highlighted {
  background-color: darkgray;
}

<div class="tab-nav">
    <ul>
        <li class="tab-nav-li highlighted">
            <span>The first tab</span>
        </li>
        <li class="tab-nav-li">
            <span>The second tab</span>
        </li>
        <li class="tab-nav-li">
            <span>The third tab</span>
        </li>
    </ul>
</div>
 

Run code

As you can see the above result, the color was filled, but does not match the borders.

.tab-nav {
  width: 100%;
  height: 40px;
  margin-top: 100px;
}

.tab-nav-li {
  display: inline-block;
  margin: 0 5px;
  min-width: 170px;
  min-height: 40px;
  line-height: 40px;
  perspective: 38px; /*Declaring here*/
  position: relative;
}

.tab-nav-li:before {
  content: "";
  width: 100%;
  height: 40px;
  position: absolute;
  border: solid 1px gray;
  border-top-left-radius: 5px;
  border-top-right-radius: 5px;
  transform: rotateX(2deg);/*Then rotate*/
  transform-origin: bottom;
}

span {
  display: block;
  text-align: center;
}

.highlighted:before {
  background-color: darkgray;
}

<div class="tab-nav">
    <ul>
        <li class="tab-nav-li highlighted">
            <span>The first tab</span>
        </li>
        <li class="tab-nav-li">
            <span>The second tab</span>
        </li>
        <li class="tab-nav-li">
            <span>The third tab</span>
        </li>
    </ul>
</div>

Run code

And higher. the color has been filled and set within the borders, but it overlays the text.

Please help me solve this problem.

, Ken

Answer 1

perspective on parent 3d transform , , , li perspective rotated, blur on span. pseudo, X-axis perspective li, ,

CSS z = 0 , 3D- .

.tab-nav {
  width: 100%;
  height: 40px;
  margin-top: 100px;
}

.tab-nav-li {
  display: inline-block;
  margin: 0 5px;
  min-width: 170px;
  min-height: 40px;
  line-height: 40px;
  perspective: 38px; /*Declaring here*/
  position: relative;
}

.tab-nav-li:before {
  content: "";
  width: 100%;
  height: 40px;
  position: absolute;
  border: solid 1px gray;
  border-top-left-radius: 5px;
  border-top-right-radius: 5px;
  transform: rotateX(2deg);/*Then rotate*/
  transform-origin: bottom;
}

span {
  display: block;
  text-align: center;
}

<div class="tab-nav">
    <ul>
        <li class="tab-nav-li">
            <span>The first tab</span>
        </li>
        <li class="tab-nav-li">
            <span>The second tab</span>
        </li>
        <li class="tab-nav-li">
            <span>The third tab</span>
        </li>
    </ul>
</div>

Answer 2

display:inline-block, "reset" , . :

.tab-nav {
    width: 100%;
    height: 40px;
    margin-top: 100px;
}

.tab-nav-li {
    display: inline-block;
    border: solid 1px gray;
    margin: 0 5px;
    min-width: 170px;
    min-height: 40px;
    line-height: 40px;
    text-align: center;
    border-top-left-radius: 5px;
    border-top-right-radius: 5px;
    transform: perspective(38px) rotateX(5deg);
    transform-origin: 50%;
}

.tab-nav-li span {
    display: inline-block;
    transform: perspective(38px) rotateX(-5deg);
}

<div class="tab-nav">
    <ul>
        <li class="tab-nav-li">
            <span>The first tab</span>
        </li>
        <li class="tab-nav-li">
            <span>The second tab</span>
        </li>
        <li class="tab-nav-li">
            <span>The third tab</span>
        </li>
    </ul>
</div>

FF, MacBook FF. , , .

, !