easy way to get width (no length) of text inside tage

[sobhan konari]

hi ,guys

I have a span tag that a line is bottom of it , I want to get width of each character .

then for example I want width of line be the same of 2 character of word.

I want type my word in Persia than in it the character width not equal to itself . thanks

https://www.imageupload.co.uk/images/2018/02/07/IMG_20180207_192506.jpg

span{
        margin:0 auto;
        font-size:40px;
        display: inline-block;
        position: relative;
    }

span:after{
    position: absolute;
        content: "";
        border:1px solid #f30;
        left:0;
        top:55px;
        width:45px;
}

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