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Preload key resources with the preload_tag filter
Themes
Effective September 29, 2021
You can now take advantage of preload links in Liquid by using the preload_tag
filter. The filter will add a link tag with rel=preload
to the page, and will attempt to add an entry to the response's Link header.
Learn more about the preload_tag filter in the Shopify Developer Docs.