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Remove unused stylesheets when navigating #1128

Merged
merged 1 commit into from Jan 15, 2024
Merged

Remove unused stylesheets when navigating #1128

merged 1 commit into from Jan 15, 2024

Commits on Jan 15, 2024

  1. Remove unused stylesheets when navigating 

    When navigating to another page, Turbo merges the `<head>` contents from
the current and new pages, which results in a `<head>` containing the
superset of both.

For certain items, like scripts, this makes sense. We have no way to
remove a running script. But that's not the case for styles: styles can
be unloaded easily, and for the page to display properly, we need to do
so. Otherwise styles kept in scope from a previous page could cause a
page to render incorrectly.

The common way to avoid this has been to use `data-turbo-track="reload"`
to force a reload if styles change. This works, but it's a bit
heavy-handed, causing full page reloads that could have been avoided.

There are a couple of common cases where updating styles on the fly
would be useful:

- Deploying a CSS change. Clients should be able to pick up the change
  without having to reload.

- Allowing pages to include their own specific styles, rather than
  bundle them all together for the whole site. This can reduce the size
  of the loaded CSS, and make it easier to avoid style conflicts.
    @kevinmcconnell
    kevinmcconnell committed Jan 15, 2024
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