tooltip with arrow with vue's style binding - vue.js

Question

I want to create tooltip with vue's style binding. I am thinking to use attr() function from CSS which takes attribute value which is a reactive object dynamicColor. The code which I have now is:
<div class="test">
<span class="marker" :style="{'background': dynamicColor}" :color="dynamicColor">
smallText
</span>
</div>
<style>
div.test span.marker {
position: absolute;
width: 28px;
height: 15px;
border-radius: 2px;
display: block;
top: -25px;
font-size: 10px;
text-align: center;
}
div.test span.marker::after {
content: "";
position: absolute;
top: 100%;
left: 50%;
margin-left: -5px;
border-width: 6px;
border-style: solid;
border-color: attr(color) transparent transparent transparent;
}
</style>
But it does not work. I don't want to use bootstrap due to some reasons. I tried to look if I can find for pseudo selector in vue style binding but could not find much. Any ideas on how to achieve this? Thanks.

Answer 1

As suggested by #Stephan-v in comments, I added separate element for arrow. The final code looks like something below:
<div class="test">
<span class="markertip" :style="{'border-color': dynamicColor + ' transparent transparent transparent'}"></span>
<span class="marker" :style="{'background': dynamicColor}">
smallText
</span>
</div>
<style>
div.test span.marker {
position: absolute;
width: 28px;
height: 15px;
border-radius: 2px;
display: block;
top: -25px;
font-size: 10px;
text-align: center;
}
div.test span.markertip {
content: "";
position: absolute;
top: -45%;
margin-left: -5px;
border-width: 6px;
border-style: solid;
}
</style>