JSFiddle - React, Tailwind, and code Playground

HTML

<h2>Try to select me</h2>

<div id="foo">dljafdlhjafdbdfasjhadsfh adfsjlfhads h jkfkaj fjf ajksfhajks afjk sdhfkj asfadks jfsdjf kjasdhf kjasdh fkjasdfk jadskjfhakdsjf kajsdf kjah kfjas kdjfads</div>

JavaScript

var unFocus = function () {
    if (document.selection) {
        document.selection.empty()
    } else {
        window.getSelection().removeAllRanges()
    }

}


document.getElementById('foo').onmousemove = function () {
    unFocus()
}

document.getElementById('foo').onmouseup = function () {
    unFocus()
}