JSFiddle - React, Tailwind, and code Playground

JavaScript

var inlineBlockContainer = $('<div/>').append('<div style="display:inline-block">Lorem</div>')
                                      .append('<div style="display:inline-block">Ipsum</div>');

var blockContainer = $('<div/>').append('<div style="display:block">Lorem</div>')
                                .append('<div style="display:block">Ipsum</div>');

var supportsInlineBlock = inlineBlockContainer.appendTo(document.body).height() !== blockContainer.appendTo(document.body).height();

//inlineBlockContainer.add(blockContainer).remove();

alert(supportsInlineBlock ? 'You\'ve got it going on' : 'You are old and busted');