> For the complete documentation index, see [llms.txt](https://sandeepamaranath.gitbook.io/notes/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://sandeepamaranath.gitbook.io/notes/languages-and-frameworks/html-1.md). # HTML ## Canvas {% embed url="" %} Read this and navigate left side in this doc for next pages {% endembed %} {% embed url="" %} Cheat sheet {% endembed %} HTML Canvas is an HTML element used for graphics to draw shapes. We can define canvas in HTML like any other element and then modify that or use that in JS We have 2 different APIs in JS that allows us to draw on the canvas element * Canvas API - For 2D * WebGL API - For 3D {% tabs %} {% tab title="HTML" %} ```markup /*HTML*/

``` {% endtab %} {% tab title="index.js" %} ```javascript /*index.js*/ const canvas = document.getElementById('canvas1') // for JS Intellisense use below line const canvas = /** @type {HTMLCanvasElement} */ (document.querySelector('#canvas1')) // canvas API 2D const ctx = canvas.getContext('2d') // canvas API 3D // const ctx = canvas.getContext('webgl') console.log(ctx) ctx.beginPath() // imagine, putting pencil on paper before drawing ``` {% endtab %} {% endtabs %} {% embed url="" %} --- # Agent Instructions This documentation is published with GitBook. GitBook is the documentation platform designed so that both humans and AI agents can read, navigate, and reason over technical content effectively. Learn more at gitbook.com. ## Querying This Documentation If you need additional information that is not directly available in this page, you can query the documentation dynamically by asking a question. Perform an HTTP GET request on the current page URL with the `ask` query parameter, and the optional `goal` query parameter: ``` GET https://sandeepamaranath.gitbook.io/notes/languages-and-frameworks/html-1.md?ask=&goal= ``` `ask` is the immediate question: it should be specific, self-contained, and written in natural language. `goal` is optional and describes the broader end goal you are ultimately trying to accomplish on behalf of the user. GitBook uses it to tailor the answer towards what is most useful for that goal. The response will contain a direct answer to the question and relevant excerpts and sources from the documentation. Use this mechanism when the answer is not explicitly present in the current page, you need clarification or additional context, or you want to retrieve related documentation sections.