md`## How To & Techniques * #### [Visualization](https://observablehq.com/collection/@observablehq/visualization)
Many examples of specific visualization techniques (many of them built with D3) can be found in the Visualization collection. * #### [Maps](https://observablehq.com/collection/@observablehq/maps)
Along similar lines, a whole trove of map projections and visualizations can be found in the Maps collection. * #### [Animation Loops](https://observablehq.com/@mbostock/animation-loops)
A philosophical discussion of some of the pros and cons of the different ways to define animation loops in Observable. * #### [Parameterized Notebooks](https://observablehq.com/@mbostock/parameterized-notebooks)
Your notebooks can parse URL parameters, in order to render and provide personalized notebooks — with specific inputs pre-filled, or saved for later. For example, here’s [a link to the Package Dependencies notebook with the Observable runtime prefilled as a URL parameter](https://beta.observablehq.com/@mbostock/package-dependencies?name=@observablehq/notebook-runtime). * #### [URL querystrings and hash parameters](https://observablehq.com/@jashkenas/url-querystrings-and-hash-parameters)
Notebooks can read and react to \`location.search\` and \`location.hash\` directly, in order to link to particular configurations of a notebook, or allow readers to share URLs with small amounts of associated data. * #### [Responsive Notebook Design](https://observablehq.com/@tmcw/responsive-notebook-design-protips)
A set of tips to help create notebooks that re-render responsively (and reactively!) to the width of the page. This is one of those things that may very well be easier in Observable than anywhere else, as you can just use the reactive \`width\` variable. * #### [Module Require Debugger](https://observablehq.com/@tmcw/module-require-debugger)
A helpful tool that, given the name of an npm module, will attempt to deduce how to require it correctly in Observable. * #### [How To: Require Stubborn Modules](https://observablehq.com/@tmcw/requiring-modules-troubleshooting) A more in-depth discussion of requiring JavaScript modules in Observable, and how to successfully load modules that may appear hopeless at first attempt. * #### [Reading Local Files](https://observablehq.com/@mbostock/reading-local-files)
Demonstrates a few techniques and helper functions from the standard library for reading local files into a notebook. * #### [Fullscreen Canvas](https://observablehq.com/@mbostock/fullscreen-canvas)
How to add a button to your notebook that causes a \`