Set CSS style for an element

ele.style.backgroundColor = 'red';
ele.style['backgroundColor'] = 'red';
ele.style['background-color'] = 'red';

// Add new style
el.style.cssText += 'background-color: red; color: white';

// Ignore previous styles
el.style.cssText = 'background-color: red; color: white';

ele.style.removeProperty('background-color');

// Does NOT work
ele.style.removeProperty('backgroundColor');