Issue with Inline JavaScript in `href` tag not functioning correctly in Firefox

I am encountering an issue with this inline JavaScript not working in Firefox. I need to figure out how to make it function correctly in Firefox.

<!DOCTYPE html>
<html>
<head>
    <meta charset="utf-8" />
    <style>
        h2 {display:inline; padding:0px 7px 0px;}
        h2 a {text-decoration:none}
        h2 a:link {color:#FFFFFF;} 
        h2#s0 {background-color:black;}
    </style>
</head>
<body>
    <h2 id="s0"><a href="javascript:document.getElementById('d0').style.display='block';">
Click me!</a></h2> 
    <div id="d0"
style="width:98%;border: 5px solid #000000;padding:3px; display:none;">
When you click the heading, this text should appear with a black
outline, with no gap between that and the heading background.</div>
</body>
</html>

In Safari, everything displays as expected. However, in Firefox, there is a momentary glitch where the page appears like it's in quirks mode before everything suddenly disappears and only the word "block" remains visible. Initially, I thought Firefox was blocking the script, but it seems to say "inline".

EDIT: I have managed to solve the JavaScript issue, but now I'm facing a discrepancy in the appearance of the heading background. In Safari, it extends down to the div border, unlike in Firefox. Is there a way to achieve consistent behavior across both browsers?

Answer №1

The most suitable working version based on your requirement is as follows:

<a href="javascript:void(document.getElementById('d0').style.display='block');">

The reason being:

When a browser executes a URI starting with javascript:, it processes the code in that URI and then updates the content of the page with the result, unless the result is undefined. The void operator can be used to return undefined.

onclick would be a more appropriate choice in this scenario.

Answer №2

While using Firefox version 41.0.1 on OSX, I encountered a similar issue in a fiddle. The reason for it not functioning properly is still unclear; it could possibly be a bug within the browser itself. However, there is a workaround that you can implement to achieve a somewhat comparable solution:

<a href="#" onclick="document.getElementById('d0').style.display='block';">

Answer №3

Here is a suggestion for updating your link:

<a href="javaScript: void(0);" onclick="javascript:document.getElementById('d0').style.display='block';">

It appears that Firefox may attempt to open a URL if the javaScript call is placed in the href attribute (as evidenced by the location bar). Moving it to the onclick seems to resolve this issue.

You could also consider utilizing preventDefault or using a href="#", but based on my testing, a href="javaScript: void(0);" has proven to work reliably across all browsers.

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