diff --git a/5-network/02-formdata/article.md b/5-network/02-formdata/article.md
@@ -1,26 +1,26 @@

# FormData

-This chapter is about sending HTML forms: with or without files, with additional fields and so on.

-[FormData](https://xhr.spec.whatwg.org/#interface-formdata) objects can help with that. As you might have guessed, it's the object to represent HTML form data.

-The constructor is:
```js
let formData = new FormData([form]);
```

-If HTML `form` element is provided, it automatically captures its fields.

-The special thing about `FormData` is that network methods, such as `fetch`, can accept a `FormData` object as a body. It's encoded and sent out with `Content-Type: multipart/form-data`.

-From the server point of view, that looks like a usual form submission.

-## Sending a simple form

-Let's send a simple form first.
-
-As you can see, that's almost one-liner:

```html run autorun
<form id="formElem">
@@ -47,26 +47,26 @@ As you can see, that's almost one-liner:
</script>
```

-In this example, the server code is not presented, as it's beyond our scope. The server accepts the POST request and replies "User saved".

-## FormData Methods

-We can modify fields in `FormData` with methods:

-- `formData.append(name, value)` - add a form field with the given `name` and `value`,
-- `formData.append(name, blob, fileName)` - add a field as if it were `<input type="file">`, the third argument `fileName` sets file name (not form field name), as it were a name of the file in user's filesystem,
-- `formData.delete(name)` - remove the field with the given `name`,
-- `formData.get(name)` - get the value of the field with the given `name`,
-- `formData.has(name)` - if there exists a field with the given `name`, returns `true`, otherwise `false`

-A form is technically allowed to have many fields with the same `name`, so multiple calls to `append` add more same-named fields.

-There's also method `set`, with the same syntax as `append`. The difference is that `.set` removes all fields with the given `name`, and then appends a new field. So it makes sure there's only one field with such `name`, the rest is just like `append`:

- `formData.set(name, value)`,
- `formData.set(name, blob, fileName)`.

-Also we can iterate over formData fields using `for..of` loop:

```js run
let formData = new FormData();
@@ -79,11 +79,11 @@ for(let [name, value] of formData) {
}
```

-## Sending a form with a file

-The form is always sent as `Content-Type: multipart/form-data`, this encoding allows to send files. So, `<input type="file">` fields are sent also, similar to a usual form submission.

-Here's an example with such form:

```html run autorun
<form id="formElem">
@@ -110,15 +110,15 @@ Here's an example with such form:
</script>
```

-## Sending a form with Blob data

-As we've seen in the chapter <info:fetch>, it's easy to send dynamically generated binary data e.g. an image, as `Blob`. We can supply it directly as `fetch` parameter `body`.

-In practice though, it's often convenient to send an image not separately, but as a part of the form, with additional fields, such as "name" and other metadata.

-Also, servers are usually more suited to accept multipart-encoded forms, rather than raw binary data.

-This example submits an image from `<canvas>`, along with some other fields, as a form, using `FormData`:

```html run autorun height="90"
<body style="margin:0">
@@ -154,36 +154,36 @@ This example submits an image from `<canvas>`, along with some other fields, as
</body>
```

-Please note how the image `Blob` is added:

```js
formData.append("image", imageBlob, "image.png");
```

-That's same as if there were `<input type="file" name="image">` in the form, and the visitor submitted a file named `"image.png"` (3rd argument) with the data `imageBlob` (2nd argument) from their filesystem.

-The server reads form data and the file, as if it were a regular form submission.

-## Summary

-[FormData](https://xhr.spec.whatwg.org/#interface-formdata) objects are used to capture HTML form and submit it using `fetch` or another network method.

-We can either create `new FormData(form)` from an HTML form, or create an object without a form at all, and then append fields with methods:

- `formData.append(name, value)`
- `formData.append(name, blob, fileName)`
- `formData.set(name, value)`
- `formData.set(name, blob, fileName)`

-Let's note two peculiarities here:

-1. The `set` method removes fields with the same name, `append` doesn't. That's the only difference between them.
-2. To send a file, 3-argument syntax is needed, the last argument is a file name, that normally is taken from user filesystem for `<input type="file">`.

-Other methods are:

- `formData.delete(name)`
- `formData.get(name)`
- `formData.has(name)`

-That's it!