JSFiddle - React, Tailwind, and code Playground

HTML

<div style='width:100%;height:100%;'>
Block page for 5 sec with opacity 0.8 and hourglass
<br>
<br>
<textarea id='textareaId' style="margin:30px;height:50%;width:50%;border:solid">
Bock text area for 5 sec with 
transparent mask and hourglass
</textarea>
</div>

CSS

html, body {
    height: 100%;
    width: 100%
}

JavaScript

// elemOrId - jquery element or element id, defaults to $('<body>')'
// settings.color defaults to 'transparent'
// settings.opacity defaults to 1
// settings.zIndex defaults to 2147483647
// if settings.hourglasss==true change cursor to hourglass over mask
function maskOn(elemOrId, settings) {
    var elem=elemFromParam(elemOrId);
    if (!elem) return;

    var maskDiv=elem.data('maskDiv');
    if (!maskDiv) {
        maskDiv=$('<div style="position:fixed;display:inline"></div>');
        $('body').append(maskDiv);
        elem.data('maskDiv', maskDiv);
    }

    if (typeof settings==='undefined' || settings===null) settings={};
    if (typeof settings.color==='undefined' || settings.color===null) settings.color='transparent';
    if (typeof settings.opacity==='undefined' || settings.opacity===null) settings.opacity=1;
    if (typeof settings.zIndex==='undefined' || settings.zIndex===null) settings.zIndex=2147483647;
    if (typeof settings.hourglass==='undefined' || settings.hourglass===null) settings.hourglass=false;

    // stretch maskdiv over elem
    var offsetParent = elem.offsetParent();
    var widthPercents=elem.outerWidth()*100/offsetParent.outerWidth()+'%';
    var heightPercents=elem.outerHeight()*100/offsetParent.outerHeight()+'%';
    maskDiv.width(widthPercents);
    maskDiv.height(heightPercents);
    maskDiv.offset(elem.offset());

    // set styles
    maskDiv[0].style.backgroundColor = settings.color;
    maskDiv[0].style.opacity = settings.opacity;
    maskDiv[0].style.zIndex = settings.zIndex;

    if (settings.hourglass) hourglassOn(maskDiv);

    return maskDiv;
}

// elemOrId - jquery element or element id, defaults to $('<body>')'
function maskOff(elemOrId) {
    var elem=elemFromParam(elemOrId);
    if (!elem) return;

    var maskDiv=elem.data('maskDiv');
    if (!maskDiv) {
        console.log('maskOff no mask !');
        return;
    }

    elem.removeData('maskDiv');
    maskDiv.remove();
}

// elemOrId - jquery element or...