HTML is a markup language used for structuring and presenting content on the web. To learn more about HTML see https://en.wikipedia.org/wiki/HTML5.

See the HTML format user guide for more details on creating HTML output with Quarto.

format: html

## Title & Author

 title Document title subtitle Identifies the subtitle of the document. date Document date author Author or authors of the document abstract Summary of document abstract-title Title used to label document abstract doi Displays the document Digital Object Identifier in the header.

## Format Options

 theme Theme name, theme scss file, or a mix of both. minimal Disables the built in html features like theming, anchor sections, code block behavior, and more. css One or more CSS style sheets. anchor-sections Enables hover over a section title to see an anchor link. html-math-method Method use to render math in HTML output (plain, webtex, gladtex, mathml, mathjax, katex) section-divs Wrap sections in 
tags and attach identifiers to the enclosing 
rather than the heading itself. identifier-prefix Specify a prefix to be added to all identifiers and internal links in HTML and DocBook output, and to footnote numbers in Markdown and Haddock output. This is useful for preventing duplicate identifiers when generating fragments to be included in other pages. email-obfuscation Specify a method for obfuscating mailto: links in HTML documents. none leaves mailto: links as they are. javascript obfuscates them using JavaScript. references obfuscates them by printing their letters as decimal or hexadecimal character references. The default is none. html-q-tags Use  tags for quotes in HTML.

 toc Include an automatically generated table of contents (or, in the case of latex, context, docx, odt, opendocument, rst, or ms, an instruction to create one) in the output document. This option has no effect if standalone is false. Note that if you are producing a PDF via ms, the table of contents will appear at the beginning of the document, before the title. If you would prefer it to be at the end of the document, use the option pdf-engine-opt: --no-toc-relocation. toc-float Use a floating table of contents for this document. toc-depth Specify the number of section levels to include in the table of contents. The default is 3 toc-title The title used for the table of contents.

## Numbering

 number-sections Number section headings rendered ouptut. By default, sections are not numbered. Sections with class .unnumbered will never be numbered, even if number-sections is specified. number-depth By default, all headings in your document create a numbered section. You customize numbering depth using the number-depth option. For example, to only number sections immediately below the chapter level, use this: number-depth: 1 number-offset Offset for section headings in output (offsets are 0 by default) The first number is added to the section number for top-level headings, the second for second-level headings, and so on. So, for example, if you want the first top-level heading in your document to be numbered “6”, specify number-offset: 5. If your document starts with a level-2 heading which you want to be numbered “1.5”, specify number-offset: [1,4]. Implies number-sections shift-heading-level-by Shift heading levels by a positive or negative integer. For example, with shift-heading-level-by: -1, level 2 headings become level 1 headings, and level 3 headings become level 2 headings. Headings cannot have a level less than 1, so a heading that would be shifted below level 1 becomes a regular paragraph. Exception: with a shift of -N, a level-N heading at the beginning of the document replaces the metadata title.

## Fonts

 mainfont For HTML output, sets the CSS font-family on the HTML element. For LaTeX output, the main font family for use with xelatex or lualatex. Takes the name of any system font, using the fontspec package. For ConTeXt output, the main font family. Use the name of any system font. See ConTeXt Fonts for more information. monofont For HTML output, sets the CSS font-family property on code elements. For PowerPoint output, sets the font used for code. For LaTeX output, the monospace font family for use with xelatex or lualatex: take the name of any system font, using the fontspec package. For ConTeXt output, the monspace font family. Use the name of any system font. See ConTeXt Fonts for more information. fontsize For HTML output, sets the base CSS font-size property. For LaTeX and ConTeXt output, sets the font size for the document body text. linestretch For HTML output sets the CSS line-height property on the html element, which is preferred to be unitless. For LaTeX output, adjusts line spacing using the setspace package, e.g. 1.25, 1.5.

## Colors

 fontcolor Sets the CSS color property. linkcolor For HTML output, sets the CSS color property on all links. For LaTeX output, The color used for internal links using color options allowed by xcolor, including the dvipsnames, svgnames, and x11names lists. For ConTeXt output, sets the color for both external links and links within the document. monobackgroundcolor Sets the CSS background-color property on code elements and adds extra padding. backgroundcolor Sets the CSS background-color property on the html element.

## Layout

 cap-location Where to place figure and table captions (top, bottom, or margin) fig-cap-location Where to place figure captions (top, bottom, or margin) tbl-cap-location Where to place table captions (top, bottom, or margin) classoption For LaTeX/PDF output, the options set for the document class. For HTML output using KaTeX, you can render display math equations flush left using classoption: fleqn page-layout The page layout to use for this document (article, custom, or none) max-width Adds a css max-width to the body Element. margin-left For HTML output, sets the margin-left property on the Body element. For LaTeX output, sets the left margin if geometry is not used (otherwise geometry overrides this value) For ConTeXt output, sets the left margin if layout is not used, otherwise layout overrides these. For wkhtmltopdf sets the left page margin. margin-right For HTML output, sets the margin-right property on the Body element. For LaTeX output, sets the right margin if geometry is not used (otherwise geometry overrides this value) For ConTeXt output, sets the right margin if layout is not used, otherwise layout overrides these. For wkhtmltopdf sets the right page margin. margin-top For HTML output, sets the margin-top property on the Body element. For LaTeX output, sets the top margin if geometry is not used (otherwise geometry overrides this value) For ConTeXt output, sets the top margin if layout is not used, otherwise layout overrides these. For wkhtmltopdf sets the top page margin. margin-bottom For HTML output, sets the margin-bottom property on the Body element. For LaTeX output, sets the bottom margin if geometry is not used (otherwise geometry overrides this value) For ConTeXt output, sets the bottom margin if layout is not used, otherwise layout overrides these. For wkhtmltopdf sets the bottom page margin.

## Code

 code-fold Collapse code into an HTML 
tag so the user can display it on-demand. Specify show to have the code initiallly visible. code-summary Summary text to use for code blocks collapsed using code-fold code-overflow Choose whether to scroll or wrap when code lines are too wide for their container. code-line-numbers Include line numbers in code block output. code-copy Enable a code copy icon for code blocks. Defaults to hover, which shows the icon when the mouse hovers over the code block. Set to true or false to show or hide unconditionally. code-link Enables hyper-linking of functions within code blocks to their online documentation. Code linking is currently implemented only for the knitr engine (via the downlit package). code-tools Include a code tools menu (for hiding and showing code). Use true or false to enable or disable the standard code tools menu. Specify sub-properties source, toggle, and caption to customize the behavior and appearnce of code tools. highlight-style Specifies the coloring style to be used in highlighted source code. Instead of a STYLE name, a JSON file with extension .theme may be supplied. This will be parsed as a KDE syntax highlighting theme and (if valid) used as the highlighting style. syntax-definitions KDE language syntax definition files (XML) indented-code-classes Specify classes to use for all indented code blocks

## Execution

Execution options should be specified within the execute key. For example:

execute:
echo: false
warning: false
 eval Evaluate code cells (if false just echos the code into output). echo Include cell source code in rendered output. Specify fenced to include the cell delimiter as part of the output. output Include the results of executing the code in the output (specify asis to treat output as raw markdown with no enclosing containers). warning Including warnings in rendered output. error Include errors in the output (note that this implies that errors executing code will not halt processing of the document). include Catch all for preventing any output (code or results) from being included in output. cache Cache results of computations (using the knitr cache for R documents, and Jupyter Cache for Jupyter documents). Note that cache invalidation is triggered by changes in chunk source code (or other cache attributes you’ve defined). Use refresh to force a refresh of the cache even if has not been otherwise invalidated. freeze Option to denote that computational documents should never be re-rendered during a global project render (freeze: true), or alternatively only be re-rendered when their source file changes (freeze: auto).

## Figures

 fig-cap-location Where to place figure captions (top, bottom, or margin) fig-align Default horizontal alignment for figures (left, right, center, or default) fig-width Default width for figures generated by Matplotlib or R graphics fig-height Default height for figures generated by Matplotlib or R graphics fig-format Default format for figures generated by Matplotlib or R graphics (retina, png, jpeg, svg, or pdf) fig-dpi Default DPI for figures generated by Matplotlib or R graphics fig-responsive Whether to make images in this document responsive.

## Tables

 tbl-colwidths Apply explicit table column widths for markdown grid tables and pipe tables that are more than columns characters wide (72 by default). Some formats (e.g. HTML) do an excellent job automatically sizing table columns and so don’t benefit much from column width specifications. Other formats (e.g. LaTeX) require table column sizes in order to correctly flow longer cell content (this is a major reason why tables > 72 columns wide are assigned explicit widths by Pandoc). This can be specified as: auto: Apply markdown table column widths except when there is a hyperlink in the table (which tends to throw off automatic calculation of column widths based on the markdown text width of cells). (auto is the default for HTML output formats) true: Always apply markdown table widths (true is the default for all non-HTML formats) false: Never apply markdown table widths. [40,30,30]: Array of explicit width percentages. tbl-cap-location Where to place table captions (top, bottom, or margin)

## Citations

 bibliography Document bibliography (BibTeX or CSL). May be a single file or a list of files csl Citation Style Language file to use for formatting references. citations-hover Enables a hover popup for citation that shows the reference information. citation-location Where citation information should be displayed (document or margin) citeproc Turn on built-in citation processing. To use this feature, you will need to have a document containing citations and a source of bibliographic data: either an external bibliography file or a list of references in the document’s YAML metadata. You can optionally also include a csl citation style file. citation-abbreviations JSON file containing abbreviations of journals that should be used in formatted bibliographies when form="short" is specified. The format of the file can be illustrated with an example: { "default": { "container-title": { "Lloyd's Law Reports": "Lloyd's Rep", "Estates Gazette": "EG", "Scots Law Times": "SLT" } } }

## Footnotes

 footnotes-hover reference-location Specify whether footnotes (and references, if reference-links is set) are placed at the end of the current (top-level) block, the current section, the margin, or the end of the document.

## Language

 lang Identifies the main language of the document using IETF language tags (following the BCP 47 standard), such as en or en-GB. The Language subtag lookup tool can look up or verify these tags. This affects most formats, and controls hyphenation in PDF output when using LaTeX (through babel and polyglossia) or ConTeXt. language YAML file containing custom language translations dir The base script direction for the document. For bidirectional documents, native pandoc spans and divs with the dir attribute (value rtl or ltr) can be used to override the base direction in some output formats. This may not always be necessary if the final renderer (e.g. the browser, when generating HTML) supports the [Unicode Bidirectional Algorithm]. When using LaTeX for bidirectional documents, only the xelatex engine is fully supported (use --pdf-engine=xelatex).

## Includes

 header-includes Content to include at the end of the document header. include-before Content to include at the beginning of the document body (e.g. after the  tag in HTML, or the \begin{document} command in LaTeX). include-after Content to include at the end of the document body (before the  tag in HTML, or the \end{document} command in LaTeX). include-before-body Include contents of files, verbatim, at the beginning of the document body (e.g. after the  tag in HTML, or the \begin{document} command in LaTeX). include-after-body Include contents of files, verbatim, at the end of the document body (before the  tag in HTML, or the \end{document} command in LaTeX). include-in-header Include contents of files, verbatim, at the end of the header. This can be used, for example, to include special CSS or JavaScript in HTML documents. resources Path (or glob) to files to publish with this document. metadata-files Read metadata from the supplied YAML (or JSON) files. This option can be used with every input format, but string scalars in the YAML file will always be parsed as Markdown. Generally, the input will be handled the same as in YAML metadata blocks. Values in files specified later in the list will be preferred over those specified earlier. Metadata values specified inside the document, or by using -M, overwrite values specified with this option.

 keywords List of keywords to be included in the document metadata. title-prefix Specify STRING as a prefix at the beginning of the title that appears in the HTML header (but not in the title as it appears at the beginning of the body) description-meta Sets the description metadata for the document author-meta Sets the author metadata for the document date-meta Sets the date metadata for the document

## Rendering

 from Format to read from. Extensions can be individually enabled or disabled by appending +EXTENSION or -EXTENSION to the format name (e.g. markdown+emoji). output-file Output file to write to output-ext Extension to use for generated output file template Use the specified file as a custom template for the generated document. standalone Produce output with an appropriate header and footer (e.g. a standalone HTML, LaTeX, TEI, or RTF file, not a fragment) self-contained Produce a standalone HTML file with no external dependencies, using data: URIs to incorporate the contents of linked scripts, stylesheets, images, and videos. The resulting file should be “self-contained,” in the sense that it needs no external files and no net access to be displayed properly by a browser. This option works only with HTML output formats, including html4, html5, html+lhs, html5+lhs, s5, slidy, slideous, dzslides, and revealjs. Scripts, images, and stylesheets at absolute URLs will be downloaded; those at relative URLs will be sought relative to the working directory (if the first source file is local) or relative to the base URL (if the first source file is remote). Elements with the attribute data-external="1" will be left alone; the documents they link to will not be incorporated in the document. self-contained-math Embed math libraries (e.g. MathJax) within self-contained output. Note that math libraries are not embedded by default because they are quite large and often time consuming to download. filters Specify executables or Lua scripts to be used as a filter transforming the pandoc AST after the input is parsed and before the output is written. keep-md Keep the markdown file generated by executing code keep-ipynb Keep the notebook file generated from executing code. extract-media Extract images and other media contained in or linked from the source document to the path DIR, creating it if necessary, and adjust the images references in the document so they point to the extracted files. Media are downloaded, read from the file system, or extracted from a binary container (e.g. docx), as needed. The original file paths are used if they are relative paths not containing … Otherwise filenames are constructed from the SHA1 hash of the contents. resource-path List of paths to search for images and other resources. The paths should be separated by : on Linux, UNIX, and macOS systems, and by ; on Windows. default-image-extension Specify a default extension to use when image paths/URLs have no extension. This allows you to use the same source for formats that require different kinds of images. Currently this option only affects the Markdown and LaTeX readers. abbreviations Specifies a custom abbreviations file, with abbreviations one to a line. This list is used when reading Markdown input: strings found in this list will be followed by a nonbreaking space, and the period will not produce sentence-ending space in formats like LaTeX. The strings may not contain spaces. dpi Specify the default dpi (dots per inch) value for conversion from pixels to inch/ centimeters and vice versa. (Technically, the correct term would be ppi: pixels per inch.) The default is 96. When images contain information about dpi internally, the encoded value is used instead of the default specified by this option.

## Website

 search Setting this to false prevents this document from being included in searches. aliases URLs that alias this document, when included in a website. image The path to a preview image for this content. By default, Quarto will use the image value from the site: metadata. If you provide an image, you may also optionally provide an image-width and image-height to improve the appearance of your Twitter Card. If image is not provided, Quarto will automatically attempt to locate a preview image. image-height The height of the preview image for this document. image-width The width of the preview image for this document.

## Text Output

 strip-comments Strip out HTML comments in the Markdown source, rather than passing them on to Markdown, Textile or HTML output as raw HTML. This does not apply to HTML comments inside raw HTML blocks when the markdown_in_html_blocks extension is not set. ascii Use only ASCII characters in output. Currently supported for XML and HTML formats (which use entities instead of UTF-8 when this option is selected), CommonMark, gfm, and Markdown (which use entities), roff ms (which use hexadecimal escapes), and to a limited degree LaTeX (which uses standard commands for accented characters when possible). roff man output uses ASCII by default.