257.su - Сериал 257 причин чтобы жить смотреть онлайн до эфира

257.su Site Title

Сериал 257 причин чтобы жить смотреть онлайн до эфира | 257.SU

257.su Meta Description

257 причин чтобы жить - новый сериал 2020 про девушку, которая победила рак. Смотри новые серии бесплатно прямо сейчас.

257.su Test Results

257.su Mobile Performance: 66/100

Quick overview:

Opportunities

These suggestions can help your page load faster. They don't directly affect the Performance score.

Enable text compression. Potential savings of 101 KB

Text-based resources should be served with compression (gzip, deflate or brotli) to minimize total network bytes. Learn more.

Remove unused CSS. Potential savings of 65 KB

Remove dead rules from stylesheets and defer the loading of CSS not used for above-the-fold content to reduce unnecessary bytes consumed by network activity. Learn more.

Reduce server response times (TTFB). Root document took 1,240 ms

Time To First Byte identifies the time at which your server sends a response. Learn more.

Eliminate render-blocking resources. Potential savings of 390 ms

Resources are blocking the first paint of your page. Consider delivering critical JS/CSS inline and deferring all non-critical JS/styles. Learn more.

Serve images in next-gen formats. Potential savings of 62 KB

Image formats like JPEG 2000, JPEG XR, and WebP often provide better compression than PNG or JPEG, which means faster downloads and less data consumption. Learn more.

Minify JavaScript. Potential savings of 4 KB

Minifying JavaScript files can reduce payload sizes and script parse time. Learn more.

Properly size images. Potential savings of 33 KB

Serve images that are appropriately-sized to save cellular data and improve load time. Learn more.

Efficiently encode images. Potential savings of 12 KB

Optimized images load faster and consume less cellular data. Learn more.

Diagnostics

More information about the performance of your application. These numbers don't directly affect the Performance score.

Reduce the impact of third-party code

Third-party code blocked the main thread for 270 ms

Third-party code can significantly impact load performance. Limit the number of redundant third-party providers and try to load third-party code after your page has primarily finished loading. Learn more.

Serve static assets with an efficient cache policy

31 resources found

A long cache lifetime can speed up repeat visits to your page. Learn more.

Minimize main-thread work

2.5 s

Consider reducing the time spent parsing, compiling and executing JS. You may find delivering smaller JS payloads helps with this. Learn more

Avoid an excessive DOM size

852 elements

A large DOM will increase memory usage, cause longer style calculations, and produce costly layout reflows. Learn more.

Keep request counts low and transfer sizes small

137 requests • 467 KB

To set budgets for the quantity and size of page resources, add a budget.json file. Learn more.

Avoid chaining critical requests

11 chains found

The Critical Request Chains below show you what resources are loaded with a high priority. Consider reducing the length of chains, reducing the download size of resources, or deferring the download of unnecessary resources to improve page load. Learn more.

257.su Mobile SEO: 92/100

Quick overview:

Content Best Practices

Format your HTML in a way that enables crawlers to better understand your app’s content.

Image elements do not have `[alt]` attributes

Informative elements should aim for short, descriptive alternate text. Decorative elements can be ignored with an empty alt attribute. Learn more.

257.su Mobile Best Practices: 62/100

Quick overview:

Does not use HTTPS

26 insecure requests found

All sites should be protected with HTTPS, even ones that don't handle sensitive data. HTTPS prevents intruders from tampering with or passively listening in on the communications between your app and your users, and is a prerequisite for HTTP/2 and many new web platform APIs. Learn more.

Includes front-end JavaScript libraries with known security vulnerabilities

2 vulnerabilities detected

Some third-party scripts may contain known security vulnerabilities that are easily identified and exploited by attackers. Learn more.

Links to cross-origin destinations are unsafe

Add `rel="noopener"` or `rel="noreferrer"` to any external links to improve performance and prevent security vulnerabilities. Learn more.

Browser errors were logged to the console

Errors logged to the console indicate unresolved problems. They can come from network request failures and other browser concerns. Learn more

Uses `document.write()`

For users on slow connections, external scripts dynamically injected via `document.write()` can delay page load by tens of seconds. Learn more.

257.su Mobile Progressive Web App: 41/100

Quick overview:

Installable

Does not use HTTPS

26 insecure requests found

Web app manifest does not meet the installability requirements

Browsers can proactively prompt users to add your app to their homescreen, which can lead to higher engagement. Learn more. Failures: No manifest was fetched.

Does not register a service worker that controls page and `start_url`

The service worker is the technology that enables your app to use many Progressive Web App features, such as offline, add to homescreen, and push notifications. Learn more.

PWA Optimized

Is not configured for a custom splash screen

A themed splash screen ensures a high-quality experience when users launch your app from their homescreens. Learn more. Failures: No manifest was fetched.

Does not provide a valid `apple-touch-icon`

For ideal appearance on iOS when users add a progressive web app to the home screen, define an `apple-touch-icon`. It must point to a non-transparent 192px (or 180px) square PNG. Learn More.

Does not redirect HTTP traffic to HTTPS

If you've already set up HTTPS, make sure that you redirect all HTTP traffic to HTTPS in order to enable secure web features for all your users. Learn more.

Does not set a theme color for the address bar.

The browser address bar can be themed to match your site. Learn more. Failures: No manifest was fetched, No `<meta name="theme-color">` tag found.

Fast and reliable

`start_url` does not respond with a 200 when offline

A service worker enables your web app to be reliable in unpredictable network conditions. Learn more. No usable web app manifest found on page.

Current page does not respond with a 200 when offline

If you're building a Progressive Web App, consider using a service worker so that your app can work offline. Learn more.

257.su Mobile Accessibility: 68/100

Quick overview:

Tables and lists

These are opportunities to to improve the experience of reading tabular or list data using assistive technology, like a screen reader.

Lists do not contain only `<li>` elements and script supporting elements (`<script>` and `<template>`).

Screen readers have a specific way of announcing lists. Ensuring proper list structure aids screen reader output. Learn more.

List items (`<li>`) are not contained within `<ul>` or `<ol>` parent elements.

Screen readers require list items (`<li>`) to be contained within a parent `<ul>` or `<ol>` to be announced properly. Learn more.

Names and labels

These are opportunities to improve the semantics of the controls in your application. This may enhance the experience for users of assistive technology, like a screen reader.

Form elements do not have associated labels

Labels ensure that form controls are announced properly by assistive technologies, like screen readers. Learn more.

Image elements do not have `[alt]` attributes

Informative elements should aim for short, descriptive alternate text. Decorative elements can be ignored with an empty alt attribute. Learn more.

Best practices

These items highlight common accessibility best practices.

`[id]` attributes on the page are not unique

The value of an id attribute must be unique to prevent other instances from being overlooked by assistive technologies. Learn more.

Contrast

These are opportunities to improve the legibility of your content.

Background and foreground colors do not have a sufficient contrast ratio.

Low-contrast text is difficult or impossible for many users to read. Learn more.

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