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Try: Sticky headers: Add "none" as a HTML tag option for template parts #48471

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carolinan
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What?

This is a test to see if we can make it easier to add sticky headers by allowing template parts not to have a HTML tag on the front of the website.

Why?

It is tricky to update an existing site header to be sticky because sticky groups do not work when nested inside a template part (They are stickied but only inside the closest parent).

Today, to make a header sticky, you need to create a new group, make it sticky, and move the template part inside the group. Then repeat that for every template.

If the template part had no HTML tag, the group would no longer be nested, and it would stick correctly to the browser window.

How?

By adding "None" as an option to the HTML tag selection in the Advanced panel in the block settings sidebar of the template part.
By not outputting the wrapping HTML tag and block wrapper attributes for template parts on the front of the website.

This works well if the site header follows a common pattern where a group is the first element inside the template part.
The caveat is that it only works for the front, the element in the editor must not be removed, so the front and editor do not match.

Testing Instructions

  1. Activate Twenty Twenty-Three.
  2. Open the Site Editor, select and edit the header template part.
  3. Select the first group and set the Position option to Sticky.
  4. Optionally, add a background color to the group to make the feature more visible when you scroll.
    Save.
  5. Optionally, set the HTML tag of the group to "Header".
  6. Go back to the template list in the Site Editor and open the Home template.
  7. Select the header template part. Open the Advanced panel and change the HTML tag to none. Save.
  8. View the front of the website and test the sticky header.

Screenshots or screencast

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Size Change: +22 B (0%)

Total Size: 1.33 MB

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Flaky tests detected in 6c3421d.
Some tests passed with failed attempts. The failures may not be related to this commit but are still reported for visibility. See the documentation for more information.

🔍 Workflow run URL: https://github.com/WordPress/gutenberg/actions/runs/4279991932
📝 Reported issues:

@andrewserong
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andrewserong commented Feb 28, 2023

Thanks for exploring this idea @carolinan! In principle I quite like the idea of being able to remove the template part wrapper, and I think I remember discussions elsewhere where folks were thinking about it, but I can't find the issue(s) at present.

The caveat is that it only works for the front, the element in the editor must not be removed, so the front and editor do not match.

I think this sounds like it could be a potential blocker, as there have been a lot of efforts made to ensure markup consistency between the editor and site frontend, and if users can't see the sticky positioning working as expected within the site editor, the mismatch between the two environments could be confusing. What do you think?

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