The subdomains rule allows you to restrict the subdomains on which you want the widget to show up. You can choose whether you want to specify the subdomains where the widget should show up or the ones where it should not. This comes in very handy if you have different parts of your business on different subdomains. For example:

www.site.com - Your main site
blog.site.com - Your blog
shop.site.com - Your storefront 

So if you want a widget to only show up on your blog you should specify the 

Note that you should only include the subdomain itself (blog), without the primary domain part (.site.com).

Pages

Subdomains

brand

Frequency

Personizely Documentation

Documentation

Overview

Account

Integrations

Custom fields

Goals

Placeholders

Parsers (Data Parsing Engine)

Branding

Settings

Dashboard

Popup widgets

Bar widgets

Callout widgets

Embedded widgets

Widget types

Cart progress

Product

Messenger

Coupon

HTML Code

Timer

Video

Social

Divider

Spacer

Form

Survey

Subscribe

Button

Image

Text

Headline

Widget elements

Widget steps

Track widget conversion

Show widget

Execute JavaScript code

Change field value

Send webhook

Send alert

Automations

Triggers

Rules

Close triggers

Scheduling

Widget display options

A/B Testing

Widgets

Variations

Traffic split

Personalization

First Visit

First-page view

Last visit

Last page view

Visit history

Page view history

Click history

Widget history

Order history

UTM Paremeters

Query string

Fields

Referrer

Entry page

Cookie

Location

Browser

Device

Locale

Visitor's time

Selector

Cart value

Cart size

Cart items

Customer tags

Targeting

Client SDK

Website data