Changes to Summary description of `clientLeft/clientTop`. I **think** this is what was meant.

added a missing word

The solution explanation is not very obvious so added another example to make things clear

quick description:
before: .catch(f) is the same as promise.then(null, f)
after: .catch(f) is the same as .then(null, f)

Changed the reference to each item of the array since it was previously defined as the variable word.

When assigning the static method `staticMethod` to the `User` class, as a property directly, no parentheses should be used after `User`, since this leads to an error: `SyntaxError: Unexpected token '('`. For this reason, such parentheses have to be removed.

in the control control forms section, fixed mistake selectionEnd and selectionStart were both said to be start position

Removed duplicated `also`.

Fix: typos in <5-network/02-formdata/article.md>

Fix err in syntax

Update article.md

fixed a word 'operational' to be 'operating'

typo

Update article.md

replace russian-english comment with english

modified a sentence

'and want' to implement...

...onentsjs
Renew link for polyfill about webcomponentsjs

Fix incorrect method call to querySelector

fixes

Fix wrong answer

fix run-on sentence

Make minor grammar corrections/updates to async/promise-error-handling

Make minor grammar corrections/updates to async/promise-api

Make minor grammar corrections/updates to async/promisify

Fix typo

fix typo

Fixed small typo in 'Page: DOMContentLoaded, load, beforeunload, unload' article.md

Make minor grammar corrections/updates to async/promise-chaining

Make minor grammar corrections/updates to async/async-await

Fixed typo in article.md