This document discusses Selenium, an open source tool used for automating web application testing. It describes the different components of Selenium including Selenium IDE for recording and playback of tests, Selenium WebDriver for programmatic control of browsers, and Selenium Grid for distributed testing across multiple machines. It discusses the architecture of Selenium WebDriver, how it uses layers of libraries with Google Closure Library at the bottom. The document focuses on how the remote WebDriver protocol was developed to provide a uniform interface across language bindings and details how this was initially implemented based on the Firefox driver and Mozilla's XPCOM system.

1. SELENIUM TRAINING
IN MOHALI
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2. Selenium is a program mechanization
instrument, normally utilized for composing end-to-end
trial of web applications.
A program mechanization apparatus does
precisely what you would expect: robotize the control
of a program so dreary errands can be computerized. It
sounds like a straightforward issue to comprehend,
however as we will see, a great deal needs to occur off
camera to influence it to work.

3. Before portraying the engineering of Selenium it
sees how the different related bits of the venture fit
together. At an abnormal state, Selenium is a suite of
three apparatuses. The first of these apparatuses,
Selenium IDE, is an expansion for Firefox that enables
clients to record and playback tests.

4. The last device, Selenium Grid, makes it
conceivable to utilize the Selenium APIs to control
program examples circulated over a framework of
machines, enabling more tests to keep running in
parallel. selenium training in Bangalore - Inside the
undertaking, they are alluded to as "IDE", "WebDriver"
and "Lattice". This part investigates the engineering of
Selenium WebDriver.

5. LAYERS ANDJAVASCRIPT:-
A program robotization device is basically worked
of three moving parts:
– A method for grilling the DOM.
– A system for executing Javascript.
– Some methods for copying client input.

6. This area concentrates on the initial segment:
giving a component to cross examine the DOM. The
most widely used language of the program is Javascript,
and this appears like the perfect dialect to utilize while
cross examining the DOM.
In spite of the fact that this decision appears
glaringly evident, making it prompts some fascinating
difficulties and contending necessities that need
adjusting when contemplating Javascript.

7. Like most expansive ventures, Selenium makes
utilization of a layered arrangement of libraries. The
base layer is Google's Closure Library, which supplies
primitives and a modularization system permitting
source documents to be kept centered and as little as
could be expected under the circumstances.
At long last, there are connector layers that form
iotas keeping in mind the end goal to meet the API
contracts of both WebDriver and Core.

8. THE REMOTE DRIVER AND THEFIREFOX
DRIVER IN PARTICULAR:-
The remote WebDriver was initially a celebrated
RPC system. It has since developed into one of the key
components we use to decrease the cost of keeping up
WebDriver by giving a uniform interface that dialect
ties can code against.

9. Despite the fact that we've pushed as a
significant part of the rationale as we can out of the
dialect ties and into the driver, if every driver expected
to convey by means of a special convention we would
even now have a tremendous measure of code to
rehash over all the dialect ties.

10. The remote WebDriver convention is utilized
wherever we have to speak with a program example
that is coming up short on process.
Outlining this convention implied thinking about
various concerns. The greater part of these were
specialized, be that as it may, this being open source,
there was additionally the social angle to consider.

11. Any RPC system is part into two pieces: the
vehicle and the encoding. We realized that anyway we
actualized the remote WebDriver convention, we
would require bolster for the two pieces in the dialects
we needed to use as customers. The primary cycle of
the plan was created as a feature of the Firefox driver.

12. Mozilla, and in this manner Firefox, was
dependably observed similar to a multi-stage
application by its engineers. Keeping in mind the end
goal to encourage the advancement, Mozilla made a
system roused by Microsoft's COM that enabled parts
to be assembled and blasted together called XPCOM
(cross-stage COM). A XPCOM interface is proclaimed
utilizing IDL, and there are dialect ties for C and
Javascript and in addition different dialects.

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