#### $$\KaTeX$$ Clickable URLs

`$$\url{https://google.com}$$` => $$\url{https://google.com}$$

- Click to open the URL in your **current** tab.
- These should be used sparingly; see child nodes for details.

**Note:** URLs that do not start with `https://` will be treated as same-site links. For example, `[Google](google.com)` redirects to `https://1cademy.com/google.com` when clicked.

$$\KaTeX$$ Clickable URLs

Create a link expander with Markdown link syntax: `[Google](https://google.com)` → [Google](https://google.com).

- Click the link icon to expand the link and view its URL.
- Hold the Option key while clicking to open the link in a new tab.

1Cademy Markdown Link Expanders

University of Michigan - Ann Arbor

1Cademy's HyperMD editor supports GitHub Flavored Markdown, language-specific fenced code blocks, mathematical formulas delimited by double dollar signs, emoji shortcodes, link expanders and clickable URLs, and images. The child nodes provide syntax and examples for these feature categories.

1Cademy HyperMD Markdown Guide

#### Basic Usage: ####
*Type **3** backticks followed by the name of a programming language to create code blocks / code editors with syntax highlighting for a given language.* 

#### For example a Python code block can be created like this: ####
```python
class PyCodeEditorDemo(object):
  
  def __init__(self, var=3.7):
    self.var = str("function and var are not a python keywords but def, str and return are.")
  
  def function(self) -> str:
    return self.var
```

#### Another example using Javascript this time: ####
```js
function jsCodeEditorDemo(editor) => {
  var str = "str is not a Javascript keyword but function and var are"
  console.log(str)
  return <div>{str}<div/>
} 
```
#### Note: use "js" to highlight Javascript syntax 

Language-Specific Code Blocks / Code Editors

Link Expanders and Clickable URLs

To render a mathematical formula with $$\KaTeX$$, wrap the expression in double dollar signs ($$...$$). Single dollar signs must not be used, as they can cause parse errors when multiple expressions appear in the same paragraph.

Example:
$$f(x) = x^2 + 1$$ renders as:
$$f(x) = x^2 + 1$$

$$\KaTeX$$ Math Formulas

You can place an image inside a node in two common ways:

1. Use the editor’s image button to choose a file from your device.
2. Insert a standard Markdown image reference that includes descriptive alt text and the image location, such as a local path or a web address.

Write alt text that explains what the image shows so the note remains useful if the picture cannot load.

Adding an Image to a HyperMD Note

#### Headers ####
* `# Large Title #` => Large Title
* `## Medium Title ##` => Medium Title
* `### Small Title ###` => Small Title
* `#### Smallest Title ####` => Smallest Title

#### Text Formatting ####
* `**Bold**` => **Bold** (Shortcut: `Ctrl+B`)
* `*Italics*` => *Italics* (Shortcut: `Ctrl+I`)
* `~~strikethrough~~` => ~~strikethrough~~ (Shortcut: `Ctrl+D`)

#### Other Elements ####
* `***` => Horizontal Rule
* `Footnotes[^1]` => Footnotes[^1]

#### Combining Styles ####
Markdown formatting styles can be *`nested`* and *~~combined*~~.

GitHub Flavored Markdown Syntax

To write mathematical formulas in 1Cademy, use MathJax or $$\KaTeX$$ syntax, which is similar to LaTeX. Formulas must be wrapped in double dollar signs ($$...$$). Do not use single dollar signs. This formatting can be applied in node titles, proposal summaries, reasonings, and comments.

Writing Mathematical Formulas in 1Cademy

To render an emoji in 1Cademy's HyperMD editor, type its name between colons using the syntax `:<emoji-name>:`. For example, `:gift:`, `:fire:`, and `:eggplant:` render the corresponding emojis.

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