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# Progressive Web App 34 / 100

These audits validate the aspects of a Progressive Web App.

# App can load on offline/flaky connections

Ensuring your web app can respond when the network connection is unavailable or flaky is critical to providing your users a good experience. This is achieved through use of a Service Worker.

- Has a registered Service Worker No
- URL responds with a 200 when offline No
- Cache contains start_url from manifest (alpha) No

# Page load performance is fast

Users notice if sites and apps don't perform well. These top-level metrics capture the most important perceived performance concerns.

- First meaningful paint (target: 1,600ms) (1653.0ms) 96
- Speed Index (target: 1,250) (69122) 0
  First Visual Change: ms
  Last Visual Change: ms
- Estimated Input Latency (target: 50ms) (16ms) 100
  90% probability of input latency at 16.0ms or shorter.
  (50%: 16.0ms, 75%: 16.0ms, 90%: 16.0ms, 99%: 82.0ms, 100%: 513.5ms)
- Time To Interactive (alpha) (target: 1,700) (2603ms) 87
- Content scrolls at 60fps (Coming soon) ¯\_(ツ)_/¯
- Touch input gets a response in < 150ms (Coming soon) ¯\_(ツ)_/¯
- App is interactive without jank after the first meaningful paint (Coming soon) ¯\_(ツ)_/¯

# Site is progressively enhanced

Progressive enhancement means that everyone can access the basic content and functionality of a page in any browser, and those without certain browser features may receive a reduced but not unfunctioning experience.

- Page contains some content when its scripts are not available Yes

# Network connection is secure

Security is an important part of the web for both developers and users. Moving forward, Transport Layer Security (TLS) support will be required for many APIs.

- Site is on HTTPS No
- Site redirects HTTP traffic to HTTPS No

# User can be prompted to Add to Homescreen

While users can manually add your site to their homescreen in the browser menu, the prompt (aka app install banner) will proactively prompt the user to install the app if the below requirements are met and the user has visited your site at least twice (with at least five minutes between visits).

- Has a registered Service Worker No
- Manifest exists No
- Manifest contains start_url No
- Manifest contains icons at least 144px No
- Manifest contains short_name No

# Installed web app will launch with custom splash screen

A default splash screen will be constructed, but meeting these requirements guarantee a high-quality and customizable splash screen the user sees between tapping the home screen icon and your app’s first paint.

- Manifest exists No
- Manifest contains name No
- Manifest contains background_color No
- Manifest contains theme_color No
- Manifest contains icons at least 192px No

# Address bar matches brand colors

The browser address bar can be themed to match your site. A theme-color meta tag will upgrade the address bar when a user browses the site, and the manifest theme-color will apply the same theme site-wide once it's been added to homescreen.

- Manifest exists No
- HTML has a theme-color <meta> No
- Manifest contains theme_color No

# Design is mobile-friendly

Users increasingly experience your app on mobile devices, so it's important to ensure that the experience can adapt to smaller screens.

- HTML has a viewport <meta> Yes
- Content is sized correctly for the viewport Yes

# Offline

- Has a registered Service Worker
- URL responds with a 200 when offline

# Manifest

- Cache contains start_url from manifest (alpha)
- Manifest exists
- Manifest contains start_url
- Manifest contains icons at least 144px
- Manifest contains short_name
- Manifest contains name
- Manifest contains background_color
- Manifest contains theme_color
- Manifest contains icons at least 192px

# Performance

- First meaningful paint (target: 1,600ms) (1653)
- Speed Index (target: 1,250) (69122)
  First Visual Change: ms
  Last Visual Change: ms
- Estimated Input Latency (target: 50ms) (16)
  90% probability of input latency at 16.0ms or shorter.
  (50%: 16.0ms, 75%: 16.0ms, 90%: 16.0ms, 99%: 82.0ms, 100%: 513.5ms)
- Time To Interactive (alpha) (target: 1,700) (2603)

# UX

- Content scrolls at 60fps (Coming soon)

# JavaScript

- Page contains some content when its scripts are not available (true)

# Security

- Site is on HTTPS
- Site redirects HTTP traffic to HTTPS

# HTML

- HTML has a theme-color <meta>

# Mobile Friendly

- HTML has a viewport <meta> (true)
- Content is sized correctly for the viewport (true)

# Best Practices

These audits do not affect your score but are worth a look.

- Accessibility: Element aria-* roles are valid Yes
- Accessibility: Element aria-* attributes are valid ARIA attributes Yes
- Accessibility: Background and foreground colors have a sufficient contrast ratio No
  Elements must have sufficient color contrast
  - `body > nav > form > fieldset:nth-of-type(1) > .search`
- Accessibility: Every image element has an alt attribute No
  Images must have alternate text
  - `#content > .blog-index > article:nth-of-type(1) > .entry-content > p:nth-of-type(4) > a > img`
  - `#content > .blog-index > article:nth-of-type(1) > .entry-content > p:nth-of-type(7) > a > img`
  - `#content > .blog-index > article:nth-of-type(2) > .entry-content > center > img`
- Accessibility: Every form element has a label No
  Form elements must have labels
  - `body > nav > form > fieldset:nth-of-type(1) > .search`
  - `body > nav > form > .mobile-nav > select`
- Manifest: Manifest's short_name won't be truncated when displayed on homescreen No
- Manifest: Manifest's display property is set No
- UX: Service worker makes use of push notifications, if appropriate (Coming soon) ¯\_(ツ)_/¯
- UX: Tap targets are appropriately sized for touch (Coming soon) ¯\_(ツ)_/¯
- UX: Payment forms marked up with [autocomplete] attributes (Coming soon) ¯\_(ツ)_/¯
- UX: Login forms marked up with [autocomplete] attributes (Coming soon) ¯\_(ツ)_/¯
- UX: Input fields use appropriate [type] attributes for custom keyboards (Coming soon) ¯\_(ツ)_/¯

# Performance Metrics

These encapsulate your app's performance.

- Performance: Critical Request Chains 6
  Longest request chain (shorter is better): 3
  Longest chain duration (shorter is better): 2644.94ms
  Longest chain transfer size (smaller is better): 73.97KB
  Initial navigation
  / (paulirish.com)
  / (www.paulirish.com)
  javascripts/modernizr-2.0.js (www.paulirish.com) - 1035.26ms, 27.32KB
  /css (fonts.googleapis.com) - 1150.14ms, 24.22KB
  javascripts/octopress.js (www.paulirish.com) - 1365.54ms, 26.22KB
  javascripts/ender.js (www.paulirish.com) - 1543.43ms, 39.72KB
  /Vt3t1hY.png (i.imgur.com) - 1724.42ms, 96.60KB
  images/noise.png (www.paulirish.com) - 2644.94ms, 40.23KB
- Performance: User Timing marks and measures 0