PayPal is a American international e-commerce service that enables companies and individuals to send money and to accept payments without revealing any financial details.

Stripe

Websites Using Stripe

Stripe is a developer-friendly way to accept payments online and in mobile apps.

Document Standard

Content Security Policy

Websites Using Content Security Policy

Content Security Policy is best used as defense-in-depth, to reduce the harm caused by content injection attacks.

HTTPS

Websites Using HTTPS

Websites using https protocol.

HTML5 DocType

Websites Using HTML5 DocType

The DOCTYPE is a required preamble for HTML5 websites.

X-UA-Compatible

Websites Using X-UA-Compatible

Allows a website to define how a page is rendered in Internet Explorer 8, allowing a website to decide to use IE7 style rendering over IE8 rendering.

Meta Tags

Theme Color Tag

Websites Using Theme Color Tag

Chrome for Android, since version 39 supports the "theme-color" meta tag to allow websites control the background color of the tab's UI header.

Meta Keywords

Websites Using Meta Keywords

Meta Keywords are a specific type of meta tag that appear in the HTML code of a Web page and help tell search engines what the topic of the page is.

Meta Description

Websites Using Meta Description

Meta descriptions are HTML attributes that provide concise explanations of the contents of web pages. Meta descriptions are commonly used on search engine result pages (SERPs) to display preview snippets for a given page.

Meta Robot

Websites Using Meta Robot

This page contains a meta robots tag which tells search engines and robots to index or not index the page.

Meta http-equiv

Websites Using Meta http-equiv

The http-equiv attribute provides an HTTP header for the information/value of the content attribute. The http-equiv attribute can be used to simulate an HTTP response header.