HTML

HTML files are pre-processed by default as Liquid templates. This is an optional feature and can be changed to a different template engine of your choice or disabled entirely. Furthermore, it can be configured on a per-template basis or globally. Read more at Changing a Template’s Rendering Engine.

Using the Same Input and Output Directories

Take care with the HTML template type when using the same --input and --output directory (this is not the default).

If you run Eleventy more than once, it’ll try to process your output files too which may result in duplicate template errors.

$ npx @11ty/eleventy --input=. --output=. --formats=md,html
Writing ./README/index.html from ./README.md

$ npx @11ty/eleventy --input=. --output=. --formats=md,html

The second run will attempt to write ./README/index.html from both ./README.md and ./README/index.html, resulting in a Duplicate Permalink Error (two templates writing to the same location). You can workaround this issue using the Ignores feature.

If you’re going to use --formats=html, it’s probably best not using the same input and output directories.

Related Docs

• Default Template Engine for HTML Files