Revisione articoli seconda parte

Ciao a tutti 👋
Innanzitutto vi ringrazio per il grande supporto che mi state dando nella traduzione del tutorial!
Avendo quasi concluso la traduzione della seconda parte del tutorial, è necessaria una revisione degli articoli tradotti, in modo da risolvere eventuali errori/migliorarne la qualità.

Importante
Prima di partire con una revisione verificate che non sia già stata effettuata o prenotata. Una volta deciso l'articolo da revisionare notificatelo con un commento, in questo modo evitiamo sovrapposizioni.

Per quanto riguarda le revisioni, per questo tipo di articoli sarà necessaria una sola approvazione!
La lista degli articoli da revisionare:

Document [done]

* [x] [Browser environment, specs](https://github.com/javascript-tutorial/it.javascript.info/blob/master/2-ui/1-document/01-browser-environment) (@longo-andrea)
* [x] [DOM tree](https://github.com/javascript-tutorial/it.javascript.info/blob/master/2-ui/1-document/02-dom-nodes) (@longo-andrea)
* [x] [Walking the DOM](https://github.com/javascript-tutorial/it.javascript.info/blob/master/2-ui/1-document/03-dom-navigation) (@longo-andrea)
* [x] [Searching: getElement*, querySelector*](https://github.com/javascript-tutorial/it.javascript.info/blob/master/2-ui/1-document/04-searching-elements-dom) (@longo-andrea)
* [x] [Node properties: type, tag and contents](https://github.com/javascript-tutorial/it.javascript.info/blob/master/2-ui/1-document/05-basic-dom-node-properties) (@longo-andrea)
* [x] [Attributes and properties](https://github.com/javascript-tutorial/it.javascript.info/blob/master/2-ui/1-document/06-dom-attributes-and-properties) (@longo-andrea)

Introduction to Events [done]

* [x] [Introduction to browser events](https://github.com/javascript-tutorial/it.javascript.info/blob/master/2-ui/2-events/01-introduction-browser-events) (@longo-andrea)
* [x] [Bubbling and capturing](https://github.com/javascript-tutorial/it.javascript.info/blob/master/2-ui/2-events/02-bubbling-and-capturing) (@longo-andrea)
* [x] [Event delegation](https://github.com/javascript-tutorial/it.javascript.info/blob/master/2-ui/2-events/03-event-delegation) (@longo-andrea)
* [x] [Browser default actions](https://github.com/javascript-tutorial/it.javascript.info/blob/master/2-ui/2-events/04-default-browser-action) (@longo-andrea)
* [x] [Dispatching custom events](https://github.com/javascript-tutorial/it.javascript.info/blob/master/2-ui/2-events/05-dispatch-events) (@longo-andrea)

UI Events [done]

* [x] [Mouse events](https://github.com/javascript-tutorial/it.javascript.info/blob/master/2-ui/3-event-details/1-mouse-events-basics) (@longo-andrea)
* [x] [Moving the mouse: mouseover/out, mouseenter/leave](https://github.com/javascript-tutorial/it.javascript.info/blob/master/2-ui/3-event-details/3-mousemove-mouseover-mouseout-mouseenter-mouseleave) (@longo-andrea)
* [x] [Drag'n'Drop with mouse events](https://github.com/javascript-tutorial/it.javascript.info/blob/master/2-ui/3-event-details/4-mouse-drag-and-drop) (@longo-andrea)
* [x] [Pointer events](https://github.com/javascript-tutorial/it.javascript.info/blob/master/2-ui/3-event-details/6-pointer-events) (@longo-andrea)
* [x] [Keyboard: keydown and keyup](https://github.com/javascript-tutorial/it.javascript.info/blob/master/2-ui/3-event-details/7-keyboard-events) (@longo-andrea)
* [x] [Scrolling](https://github.com/javascript-tutorial/it.javascript.info/blob/master/2-ui/3-event-details/8-onscroll) (@longo-andrea)

Forms, controls [done]

* [x] [Form properties and methods](https://github.com/javascript-tutorial/it.javascript.info/blob/master/2-ui/4-forms-controls/1-form-elements)
* [x] [Focusing: focus/blur](https://github.com/javascript-tutorial/it.javascript.info/blob/master/2-ui/4-forms-controls/2-focus-blur)
* [x] [Events: change, input, cut, copy, paste](https://github.com/javascript-tutorial/it.javascript.info/blob/master/2-ui/4-forms-controls/3-events-change-input)
* [x] [Forms: event and method submit](https://github.com/javascript-tutorial/it.javascript.info/blob/master/2-ui/4-forms-controls/4-forms-submit)

Document and resource loading [done]

* [x] [Page: DOMContentLoaded, load, beforeunload, unload](https://github.com/javascript-tutorial/it.javascript.info/blob/master/2-ui/5-loading/01-onload-ondomcontentloaded)
* [x] [Scripts: async, defer](https://github.com/javascript-tutorial/it.javascript.info/blob/master/2-ui/5-loading/02-script-async-defer)
* [x] [Resource loading: onload and onerror](https://github.com/javascript-tutorial/it.javascript.info/blob/master/2-ui/5-loading/03-onload-onerror)

Miscellaneous [done]

* [x] [Mutation observer](https://github.com/javascript-tutorial/it.javascript.info/blob/master/2-ui/99-ui-misc/01-mutation-observer)
* [x] [Selection and Range](https://github.com/javascript-tutorial/it.javascript.info/blob/master/2-ui/99-ui-misc/02-selection-range)
* [x] [Event loop: microtasks and macrotasks](https://github.com/javascript-tutorial/it.javascript.info/blob/master/2-ui/99-ui-misc/03-event-loop)

Frames and windows [done]

* [x] [Popups and window methods](https://github.com/javascript-tutorial/it.javascript.info/blob/master/3-frames-and-windows/01-popup-windows)
* [x] [Cross-window communication](https://github.com/javascript-tutorial/it.javascript.info/blob/master/3-frames-and-windows/03-cross-window-communication)
* [x] [The clickjacking attack](https://github.com/javascript-tutorial/it.javascript.info/blob/master/3-frames-and-windows/06-clickjacking)

## Network requests

* [x] [Fetch](https://github.com/javascript-tutorial/it.javascript.info/blob/master/5-network/01-fetch)
* [ ] [FormData](https://github.com/javascript-tutorial/it.javascript.info/blob/master/5-network/02-formdata)
* [ ] [Fetch: Download progress](https://github.com/javascript-tutorial/it.javascript.info/blob/master/5-network/03-fetch-progress)
* [ ] [Fetch: Abort](https://github.com/javascript-tutorial/it.javascript.info/blob/master/5-network/04-fetch-abort)
* [ ] [Fetch: Cross-Origin Requests](https://github.com/javascript-tutorial/it.javascript.info/blob/master/5-network/05-fetch-crossorigin)
* [ ] [Fetch API](https://github.com/javascript-tutorial/it.javascript.info/blob/master/5-network/06-fetch-api)
* [x] [URL objects](https://github.com/javascript-tutorial/it.javascript.info/blob/master/5-network/07-url)
* [ ] [XMLHttpRequest](https://github.com/javascript-tutorial/it.javascript.info/blob/master/5-network/08-xmlhttprequest)
* [x] [Resumable file upload](https://github.com/javascript-tutorial/it.javascript.info/blob/master/5-network/09-resume-upload)
* [ ] [Long polling](https://github.com/javascript-tutorial/it.javascript.info/blob/master/5-network/10-long-polling)
* [ ] [WebSocket](https://github.com/javascript-tutorial/it.javascript.info/blob/master/5-network/11-websocket)
* [ ] [Server Sent Events](https://github.com/javascript-tutorial/it.javascript.info/blob/master/5-network/12-server-sent-events)

Storing data in the browser [done]

* [x] [Cookies, document.cookie](https://github.com/javascript-tutorial/it.javascript.info/blob/master/6-data-storage/01-cookie)
* [x] [LocalStorage, sessionStorage](https://github.com/javascript-tutorial/it.javascript.info/blob/master/6-data-storage/02-localstorage)

## Regular expressions

* [x] [Patterns and flags](https://github.com/javascript-tutorial/it.javascript.info/blob/master/9-regular-expressions/01-regexp-introduction)
* [ ] [Character classes](https://github.com/javascript-tutorial/it.javascript.info/blob/master/9-regular-expressions/02-regexp-character-classes)
* [ ] [Unicode: flag "u" and class \\p{...}](https://github.com/javascript-tutorial/it.javascript.info/blob/master/9-regular-expressions/03-regexp-unicode) (da rivedere in buona parte, consultare l'originale in inglese)
* [ ] [Anchors: string start ^ and end $](https://github.com/javascript-tutorial/it.javascript.info/blob/master/9-regular-expressions/04-regexp-anchors)
* [ ] [Multiline mode of anchors ^ $, flag "m"](https://github.com/javascript-tutorial/it.javascript.info/blob/master/9-regular-expressions/05-regexp-multiline-mode)
* [ ] [Quantifiers +, *, ? and {n}](https://github.com/javascript-tutorial/it.javascript.info/blob/master/9-regular-expressions/09-regexp-quantifiers)

Choose one unchecked article from the listed Network requests or Regular expressions links, then compare its Italian translation with the English original. Comment with the article you are taking to avoid overlap, make the review corrections, and finish when the article is ready for its required approval.

Written by the indexing model from the issue text.