> For the complete documentation index, see [llms.txt](https://trillojs.gitbook.io/en/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://trillojs.gitbook.io/en/reference/markup.md). # Markup Trillo's language is based on HTML, so it has to define how it handles its quirks and how it tries to make our life easier where possible. ## Incomplete markup Missing tags are automatically inserted and a well formed document is always generated. ```html ``` Because the server loads pages in simulated DOM, it fills in the blanks like browsers do. The output markup will therefore include `` and the missing `` and `` tags. ## Auto-closed tags Any tag can be self-closing, e.g. `
` and `

` are both valid and will generate `
` and `

`, respectively. ```html

``` Basically this extends the common habit of adding `/>` (with or without leading space) at the end of [void tags](https://developer.mozilla.org/en-US/docs/Glossary/Void_element) to any kind of tag, void or not. Both kinds will be generated correctly in the output page. ## Private comments Comments starting with ` ``` Sometimes we want our comments to stay private. Plus, by enforcing this rule, Trillo can use its own `