<!DOCTYPE html>
<style>
div {
width: 100px;
height: 100px;
background: currentColor;
}
#div1 {
color: transparent;
}
#div2 {
color: blue;
}
</style>
<div id="div1"></div>
<div id="div2"></div>
<!DOCTYPE html>
<style>
div {
width: 100px;
height: 100px;
background: currentColor;
}
#div1 {
color: transparent;
}
#div2 {
color: blue;
}
</style>
<div id="div1"></div>
<div id="div2"></div>