The page only appears properly after clearing the cache

My floating list menu is behaving oddly in Firefox. It only displays correctly after clearing the cache, but as soon as I refresh the page, the menu breaks again.

The links inside the list elements appear wider than the text, even though I haven't set any width. Strangely, when I right-click on those links, the width seems to correct itself.

Any thoughts on what might be causing this issue?

You can view the problem in action here: https://jsfiddle.net/cc43r3nm/2/. Notice the extra space after each main item in Firefox, which disappears when you right-click and move the mouse.

Unfortunately, the Stackoverflow snippet doesn't render it correctly.


.navigation {
  position: relative;
  top: 45px;
  left: -50%;
  z-index: 800;
}
.navcontainer {
  float: right;
  position: relative;
  top: 4px;
  font-size: 16px;
}
/* More CSS styling... */

HTML:


<div class="navigation">
    <div class="navcontainer" class="first_row">
        <ul class="category_nav">
            <li class="first_navcontainer">
                <a href="">Example 1</a>
                <ul class="">
                    <li><a href="">Link</a></li>
                    <!-- more list items -->
                </ul>
            </li>
            <!-- more list items -->
        </ul>
    </div>

    <div class="navcontainer" class="second_row">
        <ul class="category_nav">
            <li class="first_navcontainer">
                <a href="">Example 6</a>
                <ul class="">
                    <li><a href="">Link</a></li>
                    <!-- more list items -->
                </ul>
            </li>
            <!-- more list items -->
        </ul>
    </div>
</div>

Answer №1

Your example lacks clarity due to unnecessary styling and markup that serve no real purpose.

In essence, the issue can be boiled down to this minimal code:

When the first letter of a floating element has a different font size, the browser incorrectly calculates its width as if the entire element had that size (unless it's an a element with focus).

span {
float:left;
}
span::first-letter {
font-size:1.5em
}
<span>This text has a larger first letter</span> This is the rest of the text

This appears to be a Firefox bug. While I'm not well-versed in Bugzilla, it's likely that others have encountered it before.

Unfortunately, there isn't a direct solution at the moment aside from waiting for the bug to be fixed. As a temporary workaround, consider removing the ::first-letter styles from your CSS. That's the best advice I can offer.

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