Polymer-library.polymer-project.org - SEO Checker

Sign up for free! PDF Export
Overview of the SEO Check
Meta information
79% 
Page quality
82% 
Page structure
97% 
Link structure
62% 
Server
29% 
External factors
100% 
SEO Score
Response time
0.74 s
File size
52.10 kB
Words
716
Media files
2
Number of links
143 internal / 2 external

Task list of SEO Improvements

Meta specifications

Title
(Critically important)
Polymer library - Polymer Project
There are word repetitions in the page title.
The length of the page title is perfect. (297 pixels out of 580 max pixel length)
Meta description
(Critically important)
The meta description is missing.
Crawlability
(Critically important)
There are no problems in accessing the website.
Canonical URL
(Important)
No canonical link is specified.
Language
(Somewhat important)
Language detected in text: en
Language defined in HTML: en
Server location: United States of America
The following language is defined by HTML: en
Alternate/Hreflang Links
(Somewhat important)
There are no alternate links specified on this page.
Other meta tags
(Somewhat important)
There is no rel next meta tag on this page.
There is no rel prev meta tag on this page.
Domain
(Somewhat important)
This page is hosted on a subdomain. Use a top level domain for better SEO results.
The domain does not contain non-latin characters.
Page URL
(Somewhat important)
No parameters were found in the URL.
No session ID was found in the URL.
The URL does not have too many subdirectories.
Charset encoding
(Somewhat important)
The charset encoding (UTF-8) is set correctly.
Doctype
(Nice to have)
The doctype HTML 5 is set correctly.
The doctype is placed at first in the HTML code.
Favicon
(Nice to have)
The favicon is linked correctly.

Meta tags

NameValue
viewportwidth=device-width, initial-scale=1.0, minimum-scale=1.0
google-site-verificationpnjjbQFvjPwaWhEXY6nSyaS9iyghmH-M_yLHBveDX2M
theme-color#1e88e5
langen
X-UA-Compatiblechrome=1
charsetutf-8

Test up to 1.000 webpages of polymer-library.polymer-project.org with our free plan!

Try For Free
No trial. It's just free!

Page quality

Content
(Critically important)
This page contains 716 words. That's ok.
18.6% of the text are stop words.
Keywords used in the page title are also used in the page content. That's good!
Words from the H1 heading are used in the page content.
The page contains a listing, which indicates a good text layout.
5 paragraphs were found on this page.
The text content is perfect.
No placeholders texts or images were found.
There are no duplicates on the site.
The average number of words per sentence of 10.79 words is good.
Frames
(Critically important)
This page does not use a frameset.
Mobile optimization
(Somewhat important)
No Apple touch icon is specified.
A viewport "width=device-width, initial-scale=1.0, minimum-scale=1.0" is provided.
Bold and strong tags
(Somewhat important)
Some tags are too long. With 82 characters this one is longer than 70 characters:
"the polymer library is in maintenance mode. for new development, we recommend lit."
Image SEO
(Somewhat important)
1 images have no alt attribute. The content of alt attributes is used by search engines.
Social Networks
(Nice to have)
There are only a few social sharing widgets on the page. Make your website popular in social networks with social sharing widgets.
Additional markup
(Nice to have)
No additional page markup was found.
HTTPS
(Somewhat important)
This website uses HTTPS to protect privacy and integrity of the exchanged data.
All included files are also transferred via HTTPS.

Media list

URLAlt attributeTitle
/images/logos/p-logo.pngPolymer Logo
/images/alerts/upgrade.svgNo alt attribute provided

Page structure

H1 heading
(Critically important)
Polymer library
The H1 heading is too short (15 characters). It should be at least 20 Characters long.
Headings
(Important)
The heading structure is perfect.

Heading structure

Heading levelContent
H1 Polymer library
Some anchor texts are used more than once.
The number of internal links is ok.
None of the anchor texts is too long.
All internal links are not using dynamic parameters.
There are 2 external links on this page.

Found links on this page

LinkAttributesAnchor text
/Home
/3.0/docs/devguide/feature-ove...Guides
/3.0/docs/devguide/feature-ove...Feature overview
/3.0/docs/quick-tourTry Polymer
/3.0/docs/install-3-0Install Polymer 3.x
/3.0/docs/first-element/intro1. Get set up
/3.0/docs/first-element/step-22. Add shadow DOM
/3.0/docs/first-element/step-33. Data binding & properties
/3.0/docs/first-element/step-44. React to input
/3.0/docs/first-element/step-55. Theming with custom properties
/3.0/docs/about_30What's new in 3.0
/3.0/docs/upgradeUpgrade guide
/3.0/docs/release-notesRelease notes
/3.0/docs/devguide/custom-elem...Custom element concepts
/3.0/docs/devguide/registering...Define an element
/3.0/docs/devguide/propertiesDeclare properties
/3.0/docs/devguide/legacy-elem...Working with legacy elements
/3.0/docs/devguide/shadow-domShadow DOM concepts
/3.0/docs/devguide/dom-templateDOM templating
/3.0/docs/devguide/style-shado...Style shadow DOM
/3.0/docs/devguide/custom-css-...Custom CSS properties
/3.0/docs/devguide/eventsHandle and fire events
/3.0/docs/devguide/gesture-eventsGesture events
/3.0/docs/devguide/data-systemData system concepts
/3.0/docs/devguide/model-dataWork with object and array data
/3.0/docs/devguide/observersObservers and computed properties
/3.0/docs/devguide/data-bindingData binding
/3.0/docs/devguide/templatesHelper elements
/3.0/docs/browsersOverview
/3.0/docs/polyfillsPolyfills
/3.0/docs/es6ES6 and modules
/3.0/docs/tools/overviewTools overview
/3.0/docs/tools/polymer-cliPolymer CLI
/3.0/docs/tools/polymer-cli-co...CLI commands
/3.0/docs/tools/create-element...Create an element project
/3.0/docs/tools/create-app-pol...Create an application project
/3.0/docs/tools/documentationDocument your elements
/3.0/docs/tools/testsTest your elements
/3.0/docs/tools/polymer-jsonpolymer.json specification
/3.0/docs/tools/node-supportNode support
/3.0/docs/apps/Text duplicate Overview
/3.0/docs/apps/templatesApp templates
/3.0/docs/apps/build-for-produ...Build for production
/3.0/docs/apps/serveServe your app
/3.0/docs/apps/prplThe PRPL pattern
/3.0/docs/apps/service-workerService worker
/3.0/docs/glossaryGlossary
/3.0/docs/devguide/settingsGlobal settings
/3.0/api/API Reference
/3.0/api/index
/3.0/api/polymer-elementpolymer-element.js
/3.0/api/elements/array-selectorarray-selector.js
/3.0/api/elements/custom-stylecustom-style.js
/3.0/api/elements/dom-binddom-bind.js
/3.0/api/elements/dom-ifdom-if.js
/3.0/api/elements/dom-moduledom-module.js
/3.0/api/elements/dom-repeatdom-repeat.js
/3.0/api/mixins/dir-mixindir-mixin.js
/3.0/api/mixins/disable-upgrad...disable-upgrade-mixin.js
/3.0/api/mixins/element-mixinelement-mixin.js
/3.0/api/mixins/gesture-event-...gesture-event-listeners.js
/3.0/api/mixins/mutable-datamutable-data.js
/3.0/api/mixins/properties-cha...properties-changed.js
/3.0/api/mixins/properties-mixinproperties-mixin.js
/3.0/api/mixins/property-acces...property-accessors.js
/3.0/api/mixins/property-effectsproperty-effects.js
/3.0/api/mixins/strict-binding...strict-binding-parser.js
/3.0/api/mixins/template-stamptemplate-stamp.js
/3.0/api/utils/array-splicearray-splice.js
/3.0/api/utils/asyncasync.js
/3.0/api/utils/case-mapcase-map.js
/3.0/api/utils/debouncedebounce.js
/3.0/api/utils/flattened-nodes...flattened-nodes-observer.js
/3.0/api/utils/flushflush.js
/3.0/api/utils/gesturesgestures.js
/3.0/api/utils/html-taghtml-tag.js
/3.0/api/utils/mixinmixin.js
/3.0/api/utils/pathpath.js
/3.0/api/utils/render-statusrender-status.js
/3.0/api/utils/resolve-urlresolve-url.js
/3.0/api/utils/settingssettings.js
/3.0/api/utils/style-gatherstyle-gather.js
/3.0/api/utils/telemetrytelemetry.js
/3.0/api/utils/templatizetemplatize.js
/3.0/api/legacy/classclass.js
/3.0/api/legacy/legacy-data-mixinlegacy-data-mixin.js
/3.0/api/legacy/legacy-element...legacy-element-mixin.js
/3.0/api/legacy/mutable-data-b...mutable-data-behavior.js
/3.0/api/legacy/polymer-fnpolymer-fn.js
/3.0/api/legacy/polymer.dompolymer.dom.js
/3.0/api/legacy/templatizer-be...templatizer-behavior.js
/3.0/docs/devguide/feature-ove...Text duplicate Feature overview
/3.0/docs/quick-tourText duplicate Try Polymer
/3.0/docs/install-3-0Text duplicate Install Polymer 3.x
/3.0/docs/first-element/introText duplicate 1. Get set up
/3.0/docs/first-element/step-2Text duplicate 2. Add shadow DOM
/3.0/docs/first-element/step-3Text duplicate 3. Data binding & properties
/3.0/docs/first-element/step-4Text duplicate 4. React to input
/3.0/docs/first-element/step-5Text duplicate 5. Theming with custom properties
/3.0/docs/about_30Text duplicate What's new in 3.0
/3.0/docs/upgradeText duplicate Upgrade guide
/3.0/docs/release-notesText duplicate Release notes
/3.0/docs/devguide/custom-elem...Text duplicate Custom element concepts
/3.0/docs/devguide/registering...Text duplicate Define an element
/3.0/docs/devguide/propertiesText duplicate Declare properties
/3.0/docs/devguide/legacy-elem...Text duplicate Working with legacy elements
/3.0/docs/devguide/shadow-domText duplicate Shadow DOM concepts
/3.0/docs/devguide/dom-templateText duplicate DOM templating
/3.0/docs/devguide/style-shado...Text duplicate Style shadow DOM
/3.0/docs/devguide/custom-css-...Text duplicate Custom CSS properties
/3.0/docs/devguide/eventsText duplicate Handle and fire events
/3.0/docs/devguide/gesture-eventsText duplicate Gesture events
/3.0/docs/devguide/data-systemText duplicate Data system concepts
/3.0/docs/devguide/model-dataText duplicate Work with object and array data
/3.0/docs/devguide/observersText duplicate Observers and computed properties
/3.0/docs/devguide/data-bindingText duplicate Data binding
/3.0/docs/devguide/templatesText duplicate Helper elements
/3.0/docs/browsersText duplicate Overview
/3.0/docs/polyfillsText duplicate Polyfills
/3.0/docs/es6Text duplicate ES6 and modules
/3.0/docs/tools/overviewText duplicate Tools overview
/3.0/docs/tools/polymer-cliText duplicate Polymer CLI
/3.0/docs/tools/polymer-cli-co...Text duplicate CLI commands
/3.0/docs/tools/create-element...Text duplicate Create an element project
/3.0/docs/tools/create-app-pol...Text duplicate Create an application project
/3.0/docs/tools/documentationText duplicate Document your elements
/3.0/docs/tools/testsText duplicate Test your elements
/3.0/docs/tools/polymer-jsonText duplicate polymer.json specification
/3.0/docs/tools/node-supportText duplicate Node support
/3.0/docs/apps/Text duplicate Overview
/3.0/docs/apps/templatesText duplicate App templates
/3.0/docs/apps/build-for-produ...Text duplicate Build for production
/3.0/docs/apps/serveText duplicate Serve your app
/3.0/docs/apps/prplText duplicate The PRPL pattern
/3.0/docs/apps/service-workerText duplicate Service worker
/3.0/docs/glossaryText duplicate Glossary
/3.0/docs/devguide/settingsText duplicate Global settings
https://github.com/Polymer/pol...New window External Edit on GitHub
https://lit.dev/External Lit
/3.0/docs/devguide/custom-elem...Custom elements
/3.0/docs/devguide/shadow-domShadow DOM
/3.0/docs/devguide/eventsEvents
/3.0/docs/devguide/data-systemData system
/3.0/docs/upgradeText duplicate Upgrade guide
/3.0/docs/release-notesText duplicate Release notes

Server configuration

HTTP redirects
(Critically important)
This page redirects to "https://polymer-library.polymer-project.org/3.0/docs/devguide/feature-overview"
HTTP header
(Important)
The HTML page should be transferred using GZip compression.
No X-Powered HTTP header is sent.
Performance
(Somewhat important)
The page response time of 0.74 seconds is longer than the recommended limit of 0.4 seconds. A high response time unnecessarily slows down search engine crawling and results in bad user experience as well.
The file size of the HTML document is fine (52 kB).

HTTP Response Header

NameValue
content-typetext/html; charset=utf-8
cache-controlno-cache
x-cloud-trace-context6feed6b952ca3e7d9f9f45d7ddc71267
dateThu, 15 Aug 2024 11:06:50 GMT
serverGoogle Frontend
content-length53372
statuscode200
http_versionHTTP/2

External factors

Blacklists
(Nice to have)
This website is not classified "for adult only".
This website has excellent links from other websites.
This page has backlinks from 101 referring domains.
This page has 220 backlinks.
This page has backlinks from 91 different ip addresses.
Facebook popularity
(Somewhat important)
The page has 0 shares and comments on Facebook.

Links from Wikipedia

No links from Wikipedia were found.

Robots.txt

No valid Robots.txt file was found.

Similar sites

Search preview

polymer-library.polymer-project.org › 3.0 › docs › devguide › feature-overv...
Polymer library - Polymer Project

Most important keywords

Following keywords were found. You can check the keyword optimization of this page for each keyword.

KeywordResultRecheck
Polymer74%Check
Polymer library73%Check
library72%Check
Polymer Project63%Check
Polymer data54%Check
Library provides53%Check
project52%Check
overview40%Check
Feature40%Check
guide40%Check
Show more keywords and terms

Test up to 1.000 webpages of polymer-library.polymer-project.org with our free plan!

Try For Free
No trial. It's just free!

Cookie Policy

We use cookies to make our site work and also for analytics and advertising purposes. You can enable or disable optional cookies as desired. See the following links for more information.

Contact | Privacy

We need these so the site can function properly

So we can better understand how visitors use our website

So we can serve you tailored ads and promotions