CSS: Can I select data value greater than?

Question

30

Is there a way to have (PURE CSS) div in red when age<18 and in blue where age>18

Answer 1

Here is an idea based on this previous answer where you can consider CSS variables:

.box {
  font-size:30px;
  padding:5px;
  display:inline-block;
  font-family:monospace;
  overflow:hidden;
  color:#fff;
  background:
     linear-gradient(red,red) 0 0/100% calc((18 - var(--a))*1px),
     blue;
}
.box:before {
  content:attr(style);
  text-indent:-4ch;
  display:inline-block;
}

<div style="--a:30" class="box"></div>
<div style="--a:18" class="box"></div>
<div style="--a:9 " class="box"></div>
<div style="--a:17" class="box"></div>
<div style="--a:0 " class="box"></div>

You can also do it for text coloration:

.box {
  font-size:30px;
  padding:5px;
  display:inline-block;
  font-family:monospace;
  overflow:hidden;
  border:5px solid transparent;
  background:
     linear-gradient(#fff,#fff) padding-box,
     linear-gradient(red,red) 0 0/100% calc((18 - var(--a))*1px),
     blue;
}
.box:before {
  content:attr(style);
  text-indent:-4ch;
  display:inline-block;
  color:transparent;
  background:
     linear-gradient(red,red) 0 0/100% calc((18 - var(--a))*1px),
     blue;
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
}

<div style="--a:30" class="box"></div>
<div style="--a:18" class="box"></div>
<div style="--a:9 " class="box"></div>
<div style="--a:17" class="box"></div>
<div style="--a:0 " class="box"></div>