For full control over the HTML structure of a shared page — beyond what custom CSS, JS, or HTML snippets allow — you can replace the page template entirely using the ~shareTemplate relation.

To do so:

Create a Code note with the language Embedded JavaScript (EJS).
For a shared note to apply the newly created template, apply the ~shareTemplaterelation pointing to the note created at step (1). Make use of Attribute Inheritance to apply it to multiple shared notes.

There are two important constraints to be aware of:

Because EJS templates execute arbitrary server-side JavaScript, ~shareTemplate only takes effect when backend scripting is enabled. If it is disabled (see Security), the relation is ignored and the default template is used. For the same reason, only apply templates from notes you trust.
The template note must be part of the shared subtree (just like ~shareCss, ~shareJs) in order for it to be loaded. To prevent it from being shown in the navigation, apply #shareHiddenFromTree to it.

Content of the share template

Use the original template as reference when creating a new share template.

Available variables

Your template is rendered with a context object exposing the note and its rendering environment. The most useful values are:

Variable	Description
`note`	The note being rendered. Use it to read attributes (`note.getLabelValue(...)`), `note.title`, child notes, etc.
`content`	The note's already-rendered HTML content, as a string.
`header`	Extra HTML to place in the document head for this note (used by some note types).
`isEmpty`	`true` when the note has no content of its own.
`subRoot`	The root of the shared subtree as `{ note, branch }` — handy for a site-wide title or logo.
`cssToLoad` / `jsToLoad`	Arrays of stylesheet / script URLs the default theme would inject (includes anything added via `~shareCss` / `~shareJs`).
`faviconUrl` / `logoUrl`	Resolved favicon and logo URLs.
`isStatic`	`true` during a static HTML export, `false`for a live server render.
`t`	The `i18next` translation function.
`utils`	Helper utilities such as `slugify()` and `stripTags()`.

Error handling

If your template throws an error while rendering, Trilium logs the error and quietly falls back to the default template, so a broken template never takes the shared page down.

Splitting a template into partials

A template can pull in other EJS notes as partials. Create them as child notes of the template note (each also a code / application/x-ejsnote) and reference them by title:

<%- include("header") %>

<main>
    <h1><%= note.title %></h1>
    <%- content %>
</main>

<%- include("footer") %>

Here header and footer are the titles of child notes of the template. Only direct children are resolvable, and they must be EJS code notes.