id attribute in bs carousel on 5.3.2 doesn't accept numeric values

[KOT-OPET]

Prerequisites

• [X] I have searched for duplicate or closed issues
• [X] I have validated any HTML to avoid common problems
• [X] I have read the contributing guidelines

Describe the issue

I have a following shortcode in my project:

<!-- Carousel folder. Makes a carousel with every image inside the folder you've given as an inner argument-->

{{ $allImages := $.Page.Resources.ByType "image" }}
{{ $imagesInFolder := $allImages.Match (printf "%s/*" .Inner) }}
{{ $carouselFID := .Get "id" | default "tigidik" }}

<div id="{{ $carouselFID }}" class="carousel carousel-dark slide">
    
    <div class="carousel-indicators" style="margin-bottom: -1rem !important;">

        {{ range $index, $img := $imagesInFolder }}
            <button type="button" data-bs-target="#{{ $carouselFID }}" data-bs-slide-to="{{ $index }}" {{ if eq $index 0 }}class="active" aria-current="true"{{ end }} aria-label="Slide {{ add $index 1 }}"></button>
        {{ end }}
        
    </div>
    <div class="carousel-inner">
        {{ range $index, $img := $imagesInFolder }}
             {{ $img := $img.Resize "1200x q100 Lanczos" }}
             {{ $img := $img.Fill "1200x900 q85 Lanczos" }} <!-- scaling and cropping to fit 1200x900 while maintaining original proportions -->
            <div class="carousel-item {{ if eq $index 0 }}active{{ end }}">
                <img src="{{ $img.RelPermalink }}" class="d-block w-100" loading="lazy" alt="carousel is broken">
                <p class="dot-cs">
                    <b><a href="{{ $img }}">·&nbsp;</a></b>
                </p>
            </div>
        {{ end }}
    </div>
    <button class="carousel-control-prev" type="button" data-bs-target="#{{ $carouselFID }}" data-bs-slide="prev" style="left: -30px !important;">
        <span class="carousel-control-prev-icon" aria-hidden="true"></span>
        <span class="visually-hidden">Previous</span>
    </button>
    <button class="carousel-control-next" type="button" data-bs-target="#{{ $carouselFID }}" data-bs-slide="next" style="right: -30px !important;">
        <span class="carousel-control-next-icon" aria-hidden="true"></span>
        <span class="visually-hidden">Next</span>
    </button>
</div>

This is a pretty much default bootstrap carousel with a bit of hugo html templating and custom styles.

After updating from 5.3.1 to 5.3.2 all my carousels stopped working. Buttons have become unresponsive.

I think I found a bug. Turns out, the carousel stops working if you assign a numeric value to div id= attribute. All my ids are numeric, so basically my whole website is broken on the 5.3.2 version. However, it worked on 5.3.1.

I checked it with codepen, and you can see a test case below.

<!-- in bootstrap 5.3.2 numeric id (666) breaks the carousel -->

<div id="666" class="carousel carousel-dark slide">
  <div class="carousel-indicators">
    <button type="button" data-bs-target="#666" data-bs-slide-to="0" class="active" aria-current="true" aria-label="Slide 1"></button>
    <button type="button" data-bs-target="#666" data-bs-slide-to="1" aria-label="Slide 2"></button>
    <button type="button" data-bs-target="#carouselExampleIndicators" data-bs-slide-to="2" aria-label="Slide 3"></button>
  </div>
  <div class="carousel-inner">
    <div class="carousel-item active">
      <img src="..." class="d-block w-100" alt="...">
    </div>
    <div class="carousel-item">
      <img src="..." class="d-block w-100" alt="...">
    </div>
    <div class="carousel-item">
      <img src="..." class="d-block w-100" alt="...">
    </div>
  </div>
  <button class="carousel-control-prev" type="button" data-bs-target="#666" data-bs-slide="prev">
    <span class="carousel-control-prev-icon" aria-hidden="true"></span>
    <span class="visually-hidden">Previous</span>
  </button>
  <button class="carousel-control-next" type="button" data-bs-target="#666" data-bs-slide="next">
    <span class="carousel-control-next-icon" aria-hidden="true"></span>
    <span class="visually-hidden">Next</span>
  </button>
</div>

What operating system(s) are you seeing the problem on?

macOS

What browser(s) are you seeing the problem on?

Safari

What version of Bootstrap are you using?

5.3.2

[CyrilKrylatov]

Isn't that because HTML specs says that an ID should begin with a letter? https://www.w3.org/TR/html401/types.html#type-name

[KOT-OPET]

thank you! I discovered it too after I've filled the issue. So - my bad, I guess?

Still, the inconsistent behaviour of Bootstrap is confusing.

[louismaximepiton]

Hey,

Are we asked to do something here ? I can't see how to handle it properly ? Should we mention it in the migration guide or something ? Or maybe we can safely close this issue ?

[KOT-OPET]

It's up to you to decide. I'm not a competent person.

I think it's worth to be mentioned in a changelog for the last version, because this is where I've checked if the behaviour was changed.