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Selenium

Selenium is a long-established browser automation framework that controls real browsers through the WebDriver standard. It supports many languages and is widely used for testing and scraping.

Last updated June 8, 2026

Definition

Selenium is one of the oldest and most established browser automation frameworks. It controls real browsers such as Chrome, Firefox, Edge, and Safari through the WebDriver W3C standard, and is used heavily for automated testing and web scraping.

Language support

Selenium has official bindings for Python, Java, JavaScript, C#, and Ruby, giving it the broadest language coverage of the major automation tools.

How it works and why it matters

Selenium sends commands to a browser-specific driver (for example chromedriver), which translates them into real browser actions. It supports both visible and headless browser modes, executing JavaScript and rendering the full DOM for scraping.

  • Proxy support: Configure a proxy through browser options or the Selenium Wire extension, which also enables authenticated proxies.
  • Scale: Selenium Grid distributes tests and scraping jobs across many machines and browsers.

Pairing Selenium with rotating residential proxies and realistic user agents helps avoid anti-bot detection during large scraping runs.

Examples

1

Setting a proxy via Chrome options: --proxy-server=http://proxy:8000

2

Using selenium-wire to handle authenticated proxies

3

Distributing scraping jobs across browsers with Selenium Grid

Common Use Cases

Automated cross-browser testing of web applications
Scraping dynamic, JavaScript-rendered websites
Automating legacy web workflows across many languages
Distributed testing and scraping with Selenium Grid

Frequently Asked Questions

Selenium offers official bindings for Python, Java, JavaScript, C#, and Ruby, the widest language support among major browser automation tools.
You can set a proxy through the browser's options object, or use the Selenium Wire library when you need authenticated proxies with username and password.
Yes. Selenium remains the standard for broad browser and language coverage and large test grids, though newer tools like Playwright offer faster, more reliable APIs for many projects.

Keep Learning

All terms

Web Scraping

Web scraping is the automated extraction of data from websites — fetching pages programmatically and parsing their content into structured data.

Read definition

Rotating Proxy

A rotating proxy automatically assigns a different IP address from a pool for each request or on a set interval, spreading traffic across many IPs to avoid blocks.

Read definition

User Agent

A user agent is the identifying string a browser sends with every request, telling the server which browser, version and operating system you are using.

Read definition

Headless Browser

A headless browser is a real browser that runs without a visible interface, controlled by code — the workhorse for scraping JavaScript-heavy sites and automation.

Read definition
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