Why is `element.style.display` Empty Even When I Have CSS Rules?

Why CSS Style Properties Remain Empty with getElementById().style

When you utilize getElementById() to retrieve an HTML element, accessing its style property via element.style.display often returns an empty value, despite the presence of a CSS style rule like #map {display: block}.

This behavior arises because element.style only reflects the inline styles explicitly set on the element within the HTML document. If no inline styles are defined, element.style will be empty.

To access the actual computed style of an element, which incorporates both inline styles and CSS rules, utilize the window.getComputedStyle() method. This method provides a Style object representing the complete style applied to the element.

For instance, invoking console.log(window.getComputedStyle(document.getElementById('test')).display) will output "block," reflecting the #map {display: block} rule.

Although inline styling is generally discouraged in favor of CSS, understanding the distinction between element.style and window.getComputedStyle() is crucial for accurately accessing element styles in JavaScript.

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