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I can see a lot of <a href="javascript:void(0);"> on html pages. From I've read it does nothing by returning undefined. How is this different with <href="#">
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JavaScript void 0 means returning undefined (void) as a primitive value. You might come across the term “JavaScript:void(0)” while going through HTML documents. It is used to prevent any side effects caused while inserting an expression in a web page.
Generally, you want to avoid href="javascript:void(0)" , as it will cause the browser to parse the value of the link URL, which is both costly and unnecessary. It also introduces a potential XSS security vulnerability, as javascript: URLs violate Content Security Policy (CSP).
The main reason why users encounter the said error message is that Javascript is disabled on their browsers. Javascript is a plugin which is mostly disabled by default on all browsers. Here, you have to manually enable the Javascript so the site can render its page using the technology.
Disable add-ons/extensions If you've suddenly started getting the javascript void 0 error after installing a new extension/add-on, disable it and try again. What is this? Try disabling all extensions/add-ons and then access the website.
<a href="#">link</a> adds # to the browser url and jumps to the top of the page.
<a href="javascript:void(0);">link</a> simply "ignores" the link click.
<a href="#" onclick="return false;">link</a> also ignores the href.
Don't forget that in some cases javascript might be disabled (very uncommon).
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