Exploring the root of an abnormal behavior on Bootstrap 4

Currently, I am encountering an issue with a dropdown menu that I created by modifying Bootstrap's example. I had to replace buttons with links in my version. You can view the code on jfiddle. Here is the code snippet:

<a class="nav-link nav-link " href="#">aaa</a>
<a class="nav-link  nav-link dropdown-toggle dropdown-toggle-split" 
   data-toggle="dropdown" aria-haspopup="true" aria-expanded="false"></a>

The issue arises when the small triangle in the dropdown menu appears misplaced compared to how it should be displayed based on the code provided. Despite testing the code on jfiddle and getting the expected result, the same code behaves differently within my project environment. It seems like there might be variations in bootstrap versions or other factors causing this discrepancy.

I have attempted to troubleshoot using Firefox's developer tools, but have been unable to identify the exact cause of the problem. One hypothesis I considered was the use of links instead of buttons, but that explanation falls short as the jsfiddle example functions correctly.

Update: For a more comprehensive look at the code, you can refer to this link. While the code performs well on jfiddle, it fails to run properly in a standalone setup, specifically on Chrome.

Further update: I encountered additional difficulties with jfiddle while trying to debug the issue. If you would like to review the complete code, please visit the following link: link.

Answer №1

When the anchor tag

<a class="dropdown-toggle">
is left empty, the caret appears to be pushed upwards. Take a look at this image for reference: https://i.sstatic.net/hThNl.jpg

<a class="nav-link dropdown-toggle" href="/" id="navbarDropdownCategories" role="button" data-toggle="dropdown" aria-haspopup="true" aria-expanded="false"></a>

Adding content inside the anchor tags fixes the placement of the caret. The discrepancy in replicating the issue on jsfiddle was due to the non-empty content. Refer to this image for clarification: https://i.sstatic.net/VQYKo.jpg

 <a class="nav-link dropdown-toggle" href="/" id="navbarDropdownCategories" role="button" data-toggle="dropdown" aria-haspopup="true" aria-expanded="false">aaa</a>

To adjust the positioning of the caret in your CSS:

 .dropdown-toggle::after {
        vertical-align: middle !important;
    }

You can also view the demonstration on jsfiddle: https://jsfiddle.net/yhbo4w6L/

Answer №2

After thorough investigation, I have successfully identified the root cause of the issue at hand. It appears that the problem stems from the absence of

<!doctype html>

I am perplexed as to why and how this oversight impacts the caret.

Furthermore, I must acknowledge @Aditya Thakur's response, which correctly points out that the <a></a> should not be left empty in the absence of specifying the doctype. Although his answer deserves recognition, I believe this explanation is more accurate for resolving the issue.

It is imperative to always include a doctype declaration in HTML documents

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