# Block Directives **URL:** \ **Category:** Extensions\ **Created:** [October 10, 2014, 3:04am UTC](https://talk.commonmark.org/t/block-directives/802 "2014-10-10T03:04:59Z")\ **Posts on this page:** 1\ **Showing post:** 43
**Author:** ![mofosyne](https://talk.commonmark.org/user_avatar/talk.commonmark.org/mofosyne/32/1438_2.png) [@mofosyne](https://talk.commonmark.org/u/mofosyne)\ **Post date:** [October 21, 2014, 1:29pm UTC](https://talk.commonmark.org/t/block-directives/802/43 "2014-10-21T13:29:32Z")
Hmmm… - Creating form inputs: [Introducing markdown extensions for form input](http://talk.commonmark.org/t/introducing-markdown-extensions-for-form-input/432) - Generating plots and bargraphs, etc… `!plot( y=3x+2 )` - Dynamically Updated Table of Contents `!TOC` - Embedding video `!youtube[cats]` - Metadata - Printing page directives (e.g. splitting pages) `!pagesplit` - Generating output from a code snippet `!eval( print "hello world")` - Evaluating a maths input `!calc[1+1=]` - Generating a table from remote source `!table(data.csv)` - Including external commonmark files (e.g. compiling a book or report) `!include(intro.md)` - Generating QR codes `!QRcode[google](www.google.com)` - Including the first generic clipart found: `!clipart[cat dancing]( optional image url )` - Image macro generator (Very useful for sight impaired readers): `!imagemacro[Of all the front yards in all the world][The cat walks into mine](Noir Dog)` - Css overrides (block example): `!css: .underline{ text-decoration: underline; }` - Text To Speech section: `!speak[I **stress** that you should really follow the following diagrams shown below]{ pointToID="#diagram" } ` - In a slideshow, these text is hidden from view, but is spoken out loud. Can view speech in transcription window. - In html view, it is shown as a collated transcription under each header. Expandable as needed, with maybe a button to listen. - In print view, it is seen as a speech box. - This is good when writing educational material, e.g. lecturers. - Document declaration (block directive) `!CommonMark: `: - etc… --- _[View the full topic](https://talk.commonmark.org/t/block-directives/802)._