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Tagged with browser

4 cards

JavaScript Easy Theory

Browser storage in JavaScript: localStorage, sessionStorage, and cookies

Browsers offer several storage mechanisms with different persistence, size, and request-behavior trade-offs.

`localStorage` persists across sessions
`sessionStorage` lasts for the tab session
Cookies can be sent with HTTP requests

#browser #javascript #storage

Browser storage in JavaScript: localStorage, sessionStorage, and cookies

JavaScript Medium Theory

DOM basics: DOM selection, querySelector, querySelectorAll, getElementById, traversal, manipulation, createElement, appendChild, removeChild, and innerHTML vs textContent

The DOM is the browser's tree representation of the page, and JavaScript can select, traverse, and update nodes through several APIs.

Selectors return elements or node lists
DOM manipulation changes the page tree
`textContent` is safer than arbitrary `innerHTML`

#browser #dom #javascript

DOM basics: DOM selection, querySelector, querySelectorAll, getElementById, traversal, manipulation, createElement, appendChild, removeChild, and innerHTML vs textContent

JavaScript Medium Theory

JavaScript security basics: XSS, CSRF, safe DOM updates, and avoiding eval

Client-side JavaScript can create security issues when it injects unsafe content, trusts the wrong source, or executes arbitrary code.

Unsafe HTML updates can cause XSS
CSRF abuses trusted browser state
`eval` is dangerous and usually unnecessary

#browser #javascript #security

JavaScript security basics: XSS, CSRF, safe DOM updates, and avoiding eval

JavaScript Medium Theory

Single-threaded nature, JavaScript execution model, and browser vs Node.js environment

JavaScript runs user code on a single main thread, but hosts like browsers and Node.js provide different APIs around that execution model.

One call stack runs JS code
Hosts provide timers, I/O, and APIs
Browser and Node.js expose different globals and capabilities

#browser #javascript #nodejs #runtime

Single-threaded nature, JavaScript execution model, and browser vs Node.js environment