An empty href attribute within the <a> tag is valid, but it is not recommended for use in production environments as it can introduce usability and accessibility issues.
Specifically, using <a href=""> causes the link to point to the current page itself. This means that clicking such a link causes the page to reload or refresh. This may not be the intended behavior in certain scenarios, such as in Single-Page Applications (SPAs), where it can lead to unnecessary resource reloads.
However, in specific cases, developers may intentionally use an empty href to leverage the default styling or behavior of the <a> tag (e.g., changing the cursor to a hand), while defining more complex interactions or handling logic via JavaScript. For example:
<a href="" onclick="event.preventDefault(); openCustomModal();">Open Modal</a>
In this example, clicking the link does not cause a page refresh because the event.preventDefault() method prevents the default behavior. The openCustomModal() function is responsible for opening a custom modal.
Although this approach is technically feasible, for better user experience and improved website accessibility, it is recommended to use buttons (<button>) or other appropriate tags, and implement the desired visual style via CSS. This not only avoids potential usability issues but also makes the website's intent clearer and the code more understandable and maintainable.