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FSE: Parse the template before <head> gets rendered #28319

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merged 2 commits into from
Jan 20, 2021

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Description

Currently block assets (both scripts & styles) in FSE themes get loaded in the footer. That happens because wp_head() runs before we parse the template, and therefore when the <head> gets rendered we are not aware of what the page is or contains.
This can lead to FOUC and down the line it could get real messy since blocks have no way to enqueue anything in the <head>.

This PR changes that behavior by getting the template contents prior to printing the <head>.

Types of changes

  • Copied the gutenberg_render_the_template function to a new gutenberg_get_the_template_html function which returns the HTML instead of rendering it
  • The gutenberg_render_the_template function now simply echoes the result of the gutenberg_get_the_template_html function. I couldn't find it used anywhere, but for backwards-compatibility's sake I did not delete it.
  • In the template-canvas.php file we now get the template contents first, and then we continue with printing the contents of the template like before.

Checklist:

  • My code is tested.
  • My code follows the WordPress code style.
  • My code follows the accessibility standards.
  • My code has proper inline documentation.
  • I've included developer documentation if appropriate.
  • I've updated all React Native files affected by any refactorings/renamings in this PR.

@aristath aristath added [Feature] Themes Questions or issues with incorporating or styling blocks in a theme. [Feature] Full Site Editing labels Jan 19, 2021
@aristath aristath requested a review from gziolo January 19, 2021 10:47
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Size Change: +774 B (0%)

Total Size: 1.28 MB

Filename Size Change
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ℹ️ View Unchanged
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@aristath aristath changed the title Parse the template before <head> gets rendered FSE: Parse the template before <head> gets rendered Jan 19, 2021
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@gziolo gziolo left a comment

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Makes sense 👍🏻

@aristath aristath merged commit 8ff0c0a into master Jan 20, 2021
@aristath aristath deleted the try/load-blocks-before-head branch January 20, 2021 07:50
@github-actions github-actions bot added this to the Gutenberg 9.9 milestone Jan 20, 2021
aristath added a commit to aristath/q that referenced this pull request Jan 20, 2021
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