Page Class is missing a space prefix

[QuotesUK]

What happened?

1. Add a Page Class value to Category Blog
2. View HTML on article
3. Merged class names knock out generic CSS for .item-page
4. Merged class names knock out CSS targeting for the actual Page Class value

Version

6.0

Expected result

<main>
<div class="com-content-article item-page page-class">

Actual result

<main>
<div class="com-content-article item-pagepage-class">

System Information

Clean install of Joomla 6.0.3

Additional Comments

Discussion suggests this is a long standing bug and experienced admins are aware of a workaround, adding a space character before the Page Class value. However this is undocumented.

[KhushamBansal]

Hi maintainers, I would like to work on this issue. Can you assign it to me?

[chmst]

We do not assign - just start with a PR. : Please read this: #47215

[brianteeman]

This is not a bug. This is the intended behaviour

[drmenzelit]

Duplicate: #38238

[brianteeman]

@chmst should it be moved to the new area for features?

[QuotesUK]

As a long standing arrangement I accept the view this is currently regarded as intended behaviour, and may cause breaking changes if modified. However without the space prefix the consequence of merging "item-page" with "page-class" merely results in the renaming of "item-page" and does not confer any benefit. It takes away any custom css that targets "item-page". And the "page-class" isn’t valid as a new class either because it has been assimilated into "item-pagepage-class". Instead of calling this a page class it would be better described as "Item Page Suffix". Inserting your own space is a quirk to make this functional with two useful classes.