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# Code blocks

Markdown already supports code samples both inline (using single backticks like `some code here`) and in blocks. Infusion will syntax highlight HTML, CSS, and JavaScript if you provide the correct language in the formulation of the block.

So, this…

    ```html
    <button aria-pressed="false">toggle me</button>
    ```

… will result in this:

    <button aria-pressed="false">toggle me</button>

Note that the syntax highlighting uses a greyscale theme. Infusion is careful not to use color as part of its own design, because these colors may clash with those of the design being illustrated and discussed.

## Line-numbered code blocks

In addition to the basic markdown support, Infusion provides a mechanism to display code blocks with line numbers. This is via the `codeBlock` shortcode. Here is the code for a block of JavaScript with line numbers:

    {{<codeBlock lang="js" numbered="true">}}
    var toggle = demo.querySelector('[aria-pressed]');

    toggle.addEventListener('click', (e) => {
      let pressed = e.target.getAttribute('aria-pressed') === 'true';
      e.target.setAttribute('aria-pressed', !pressed);
    });
    {{</codeBlock>}}

The output will look like the following. Now you can refer to particular bits of the code by line number, like the arrow function on line `3`.

    var toggle = demo.querySelector('[aria-pressed]');

    toggle.addEventListener('click', (e) => {
      let pressed = e.target.getAttribute('aria-pressed') === 'true';
      e.target.setAttribute('aria-pressed', !pressed);
    });