Get border width from a div with plain javascript

Question

I got this style applied to a div

div#content {
border: 1px solid skyblue;  
}

and i want to be able to alert the width of the border, I ha

Answer 1

If somebody is still looking, this seems to be easiest way to do it with plain JS.

var border = 
+getComputedStyle((document.getElementById("idOfYourElement")))
.borderTopWidth.slice(0, -2)

Explanation below:
document.getElementById("idOfYourElement") - Return our HTML element.

getComputedStyle - Return css attributes of chosen element as object.

.borderTopWidth - Corresponding attribute from getComputedStyle object (return array like this: ("10px")).

.slice(0, -2) - Cut the last 2 characters from our array so we get rid of px at the end.

And + at the start - Parse rest of our string, that contains number we want, to the integer.