## Messenger Preview

                            Messenger has many different formatting options, such as bold, italics, strikethrough, monospace code, and math formatting through KaTeX. It can be hard to know what a message will look like without sending it once, so this extension shows a preview of how each message will appear before you send it.

Note: the formatting only renders properly on web Messenger. Mobile Messenger does not show any of the formatting.

All previews are performed client-side. None of your information is sent to any third-party server.

See https://www.facebook.com/help/147348452522644 for details on formatting text.

Supported functions in the LaTeX math formatting are at https://www.facebook.com/help/147348452522644.

▶ Usage

Write messages as normal. As you type, you should see a light message appear
about where it will appear when you send the message (when it actually sends,
your message might attach to the group above it). Sometimes, the preview
is a bit hidden, requiring you to scroll down within the chat.

As usual in Messenger chats, write

- *bold*
- _italics_ for _italics_
- ~strikethrough~ for ~~strikethrough~~
- \($\\right) to display inline math using LaTeX, e.g. \\left(\frac\left\{1\right\}\left\{2\right\}\\right) - \\left[\\right] to display math that takes up the whole message. This may include scrollbars and is useful for long chunks of math. - inline code - full message code - for code with syntax highlighting, use python def f\left(a,b\right): return a + b  If necessary, press ctrl+enter to create a newline within a message. The math uses a subset of KaTeX, which is itself a subset of LaTeX. See the \left[Katex Docs\right]\left(https://katex.org/docs/supported.html\right) for supported functions. Some functions only work within math that takes up the whole message \left(\\left[...\\right]\right). If anything at all is wrong, none of the message will render as math. Clicking the three dots to the left of a message then "Show Original" will remove all formatting from the message. ▶ Limitations This is an unofficial extension; Facebook might change Messenger at any time which could break this extension. The extension only works in www.messenger.com and www.facebook.com/messenger, not the preview within www.facebook.com.$

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