What's new

This document shows you what’s new in the latest release. For a detailed list of changes, see the history page.

Breaking: A change that requires action by you after upgrading to assure the site is still functional.

Change: A change in default behavior. This may requires action by you / may or may not be revertable by configuration.

New: Marks new behavior you might find interesting or comes configurable.


  • Breaking: We made changes to the menu footer. If you have your menu-footer.html partial overridden, you may have to provide additional styling in your partial. For a reference take a look into the menu-footer.html partial that is coming with the exampleSite.

    This change was made to allow your own menu footer to be placed right after the so called prefooter that comes with the theme (containing the language switch and Clear history functionality).

  • Breaking: We have changed the default colors from the original Learn theme (the purple menu header) to the Relearn defaults (the light greem menu header) as used in the official documentation.

    This change will only affect your installation if you’ve not set the themeVariant parameter in your config.toml. If you still want to use the Learn color variant, you have to explicitly set themeVariant="learn" in your config.toml.

    Note, that this will also affect your site if viewed with Internet Explorer 11 and can not be reconfigured as it does not support CSS variables.

  • Change: Due to a bug, that we couldn’t fix in a general manner for color variants, we decided to remove --MENU-SEARCH-BOX-ICONS-color.

  • New: With this release you are now capable to define your own dark mode variants.

    To make this possible, we have introduced a lot more color variables you can use in your color variants. Your old variants will still work and don’t need to be changed as apropriate fallback values are used by the theme. Nevertheless, the new colors allow for much more customization.

    To see what’s now possible, see the new variants relearn-dark and neon that are coming with this release.

  • New: You can now configure multiple color variants in your config.toml. In this case, the first variant is the default chosen on first view and a theme switch will be shown in the menu footer. See the documentation for configuration.

    Note, that the new theme switch will not work with Internet Explorer 11 as it does not support CSS variables.


  • Breaking: This release removes the themes implementation of ref/relref in favor for Hugos standard implementation. This is because of inconsistencies with the themes implementation. In advantage, your project becomes standard complient and exchanging this theme in your project to some other theme will be effortless.

    In a standard complient form you must not link to the *.md file but to its logical name. You’ll see, referencing other pages becomes much easier. All three types result in the same reference:

    Type Non-Standard Standard
    Branch bundle basics/configuration/_index.md basics/configuration
    Leaf bundle basics/configuration/index.md basics/configuration
    Page basics/configuration.md basics/configuration

    If you’ve linked from a page of one language to a page of another language, conversion is a bit more difficult but Hugo got you covered as well.

    Also, the old themes implementation allowed refs to non-existing content. This will cause Hugos implementation to show the error below and abort the generation. If your project relies on this old behavior, you can reconfigure the error handling of Hugos implementation.

    In the best case your usage of the old implementation is already standard complient and you don’t need to change anything. You’ll notice this very easily once you’ve started hugo server after an upgrade and no errors are written to the console.

    You may see errors on the console after the update in the form:

    ERROR 2021/11/19 22:29:10 [en] REF_NOT_FOUND: Ref "basics/configuration/_index.md": "hugo-theme-relearn\exampleSite\content\_index.en.md:19:22": page not found

    In this case, you must apply one of two options:

    1. Copy the old implementation files theme/hugo-theme-relearn/layouts/shortcode/ref.html and theme/hugo-theme-relearn/layouts/shortcode/relref.html to your own projects layouts/shortcode/ref.html and layouts/shortcode/relref.html respectively. This is not recommended as your project will still rely on non-standard behavior afterwards.

    2. Start up a text editor with regular expression support for search and replace. Apply the following conversions in the given order on all *.md files. This is the recommended choice.

    Type Search Replace by
    Branch bundle (ref\s+"[^"]*)/_index\.md" $1"
    Leaf bundle (ref\s+"[^"]*)/index\.md" $1"
    Page (ref\s+"[^"]*)\.md" $1"


  • Change: Although never officially documented, this release removes the font Novacento/Novecento. If you use it in an overwritten CSS please replace it with Work Sans. This change was necessary as Novacento did not provide all Latin special characters and lead to mixed styled character text eg. for czech.

  • New: The theme now supports favicons served from static/images/ named as favicon or logo in SVG, PNG or ICO format out of the box. An overridden partial layouts/partials/favicon.html may not be necessary anymore in most cases.

  • New: You can hide the table of contents menu for the whole site by setting the disableToc option in your config.toml. For an example see the example configuration.


  • New: Optional second parameter for notice shortcode to set title in box header.


  • New: Your site can now be served from a subfolder if you set baseURL and canonifyURLs=true in your config.toml. See the documentation for a detailed example.


  • Change: New colors --CODE-BLOCK-color and --CODE-BLOCK-BG-color were added to provide a fallback for Hugos syntax highlightning in case guessSyntax=true is set. Ideally the colors are set to the same values as the ones from your chosen chroma style.


  • Change: Creation of customized stylesheets was simplified down to only contain the CSS variables. Everything else can and should be deleted from your custom stylesheet to assure everything works fine. For the predefined stylesheet variants, this change is already included. The documentation was adjusted accordingly.

  • New: Hidden pages are displayed by default in their according tags page. You can now turn off this behavior by setting disableTagHiddenPages=true in your config.toml.

  • New: You can define the expansion state of your menus for the whole site by setting the alwaysopen option in your config.toml. Please see further documentation for possible values and default behavior.

  • New: New frontmatter ordersectionsby option to change immediate children sorting in menu and children shortcode. Possible values are title or weight.

  • New: Alternate content of a page is now advertised in the HTML meta tags. See Hugo documentation.


  • New: Hidden pages are displayed by default in the sitemap generated by Hugo and are therefore visible for search engine indexing. You can now turn off this behavior by setting disableSeoHiddenPages=true in your config.toml.


  • Change: In case the site’s structure contains addional *.md files not part of the site (eg files that are meant to be included by site pages - see CHANGELOG.md in the exampleSite), they will now be ignored by the search.

  • New: Hidden pages are indexed for the site search by default. You can now turn off this behavior by setting disableSearchHiddenPages=true in your config.toml.

  • New: If a search term is found in an expand shortcode, the expand will be opened.

  • New: The menu will scroll the active item into view on load.


  • Change: Syntaxhighlightning was switched to the built in Hugo mechanism. You may need to configure a new stylesheet or decide to roll you own as described on in the Hugo documentation

  • Change: In the predefined stylesheets there was a typo and --MENU-HOME-LINK-HOVERED-color must be changed to --MENU-HOME-LINK-HOVER-color.

  • Change: --MENU-HOME-LINK-color and --MENU-HOME-LINK-HOVER-color were missing in the documentation. You should add them to your custom stylesheets.

  • Change: Arrow navigation and children shortcode were ignoring setting for ordersectionsby. This is now changed and may result in different sorting order of your sub pages.

  • Change: If hidden pages are accessed directly by typing their URL, they will be exposed in the menu.

  • Change: A page without a title will be treated as hidden=true.

  • New: You can define the expansion state of your menus in the frontmatter. Please see further documentation for possible values and default behavior.

  • New: New partials for defining pre/post content for menu items and the content. See documentation for further reading.

  • New: Shortcode children with new parameter containerstyle.

  • New: New shortcode include to include arbitrary file content into a page.


  • New: Shortcode expand with new parameter to open on page load.


  • New: Mermaid config options can be set in config.toml.