Every form field, and what it sends

Under each control: the pair it adds to the request right now. Change things, then submit.

1. Typed fields

Your name (text)

hiker=

Password (password)

Hidden on screen, plain text in the request. Do not use a real one.
password=

Email (email)

email=

Photo album link (url)

Must start with a scheme, such as https://
album=

Phone (tel)

A phone keypad on phones; no format check anywhere.
phone=

Search trail names (search)

q=

Group size (number)

A quantity from 1 to 20. Try the arrow keys, or type 2.5.
group=

Notes (textarea)

Grows with its content where field-sizing is supported. Line breaks are sent as %0D%0A.
notes=

A hidden input (no label: nobody fills it in) sends this on every submit:

source=fields-gallery

2. Chosen fields

Hazards seen (checkboxes) Fallen tree
Washout
Wildlife

(nothing: no box is ticked)

Send me trail news (a checkbox with no value)
With no value attribute, a ticked box sends the word on.
(nothing: not ticked)

Trail conditions (radio buttons) Dry
Muddy
Snow or ice

(nothing: no button is chosen)

Trail (select with optgroup)

The group labels are never sent. Old Fire Road has no value attribute, so its text is sent.
trail=

Activities (select multiple)

Hold Ctrl or Command to choose more than one; each choice repeats the name.
(nothing: none chosen)

Difficulty (customizable select)

Styled with appearance: base-select where supported; an ordinary select elsewhere. It sends the same either way.
difficulty=moderate

Trailhead (input with datalist)

Suggestions only: anything you type is sent, typos included.
trailhead=

3. Specialized fields

Effort, 1 to 10 (range)

effort=5

Trail marker color (color)

marker=%232e7d32

Date hiked (date)

hiked=

Start time (time)

start=

Permit begins (datetime-local)

permit=

Season, as year and month (month)

No picker in desktop Firefox or Safari: a text box there, so type 2026-10.
season=

Work week (week)

No picker in desktop Firefox or Safari either; the format is 2026-W44.
week=

Photos (file)

The first Send button sends only file names. Send as multipart to send the files.
photos=

4. Display elements (never sent)

Permit fee estimate (output: $3 a person)
$0
(nothing: outputs are never sent)

Effort (meter)
5 of 10

Fields filled in (progress)
3 of 23

5. Buttons, and the request

The form would send this body (urlencoded; the button you press adds its own pair):

hiker=&password=&email=&album=&phone=&q=&group=&notes=&source=fields-gallery&trail=&difficulty=moderate&trailhead=&effort=5&marker=%232e7d32&hiked=&start=&permit=&season=&week=&photos=