hackmd.io

Overview

Report generated on 2025-12-14 at 09:54:49 (UTC +00:00).

2 years ago

100

HackMD - Collaborative Markdown Knowledge Base

Best way to write and share your knowledge in markdown.

https://hackmd.io/

2 high issues

6.1%

2 medium issues

6.1%

4 low issues

12.1%

25 tests passed

75.8%

0.64 seconds

14.80 kB

44 resources

Secure

SEO

Title

The title tag is perfect.

HackMD - Collaborative Markdown Knowledge Base

The title tag is the HTML element that specifies the title of the webpage. The title tag is displayed at the top of your browser, in the search results, as well as in the bookmarks bar.

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Google

Meta description

The meta description tag is good.

Best way to write and share your knowledge in markdown.

The meta description is an HTML tag that provides a short and accurate summary of the webpage. The meta description is used by search engines to identify a webpage's topic and provide relevant search results.

Learn more

Google

Headings

Only one h1 tag should be present on the webpage.

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The h tags represents the headings of the webpage. The h1 tag is the most important h tag, and describes the main topic of the page, while the rest of the tags describe the sub-topics of the webpage.

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Mozilla

Content keywords

The content has relevant keywords.

hackmd collaborative markdown knowledge

The webpage's content should contain relevant keywords that can also be found in the title of the webpage.

Image keywords

There are 18 images with missing alt attributes.

Images

The alt attribute specifies an alternate text for an image, if the image cannot be displayed. The alt attribute is also useful for search engines to identify the subject of the image, and helps screen readers describe the image.

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Google

SEO friendly URL

The URL is SEO friendly.

https://hackmd.io/

The SEO friendly URLs are URLs that contain relevant keywords with the webpage's topic, and contain no special characters besides slashes and dashes.

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Google

404 page

The website has 404 error pages.

https://hackmd.io/404-4fa1cb7557cdd8517a2e4af7639fbc34

The 404 webpage status informs the users and the search engines that a webpage is missing.

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Bing

Robots.txt

The webpage can be accessed by search engines.

A robots.txt file inform the search engines which links from the website can be accessed.

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Bing

Google

Noindex

The webpage does not have a noindex tag set.

The noindex tag instruct the search engines to not index the webpage.

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Bing

Google

In-page links

The number of links on the webpage is okay.

Internals

Externals

The in-page links should be kept at a minimum, to avoid issues with search engines not being able to crawl additional links from the webpage.

Language

The webpage has the language declared.

dev

The lang attribute declares the webpage's language, helping search engines identify the language in which the content is written, and browsers to offer translation suggestions.

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Mozilla

Favicon

The webpage has a favicon.

https://hackmd.io/apple-touch-icon.png

The favicon is the icon that is being displayed in the browser's tab, when the webpage is being bookmarked, and sometimes even in search engine results.

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Google

Performance

Text compression

The HTML file is compressed.

The HTML filesize is 14.80 kB.

The text compression helps speeding up the webpage's load by compressing the HTML's content.

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Gzip

Brotli

Google

Load time

The webpage loaded in 0.64 seconds.

The load time indicates the HTML's total load time, and does not include the external resources, such as images, scripts, or other resources.

Page size

The size of the HTML webpage is 14.80 kB.

The page size indicates the HTML's total size, and does not include the external resources, such as images, scripts, or other resources.

HTTP requests

There are fewer than 44 HTTP requests on the webpage.

The HTTP requests represents the number of external resources present on the webpage.

Image format

There are 2 images that are not using the AVIF, WebP format.

Images

The images format represents the images that are not served in a next-generation file format. Images served in a next-generation format improve the webpage's load performance.

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Google

JavaScript defer

There are 4 javascript resources without the defer attribute.

JavaScripts

The defer attribute allows the browser to download the scripts in parallel and execute them after the webpage has been parsed, improving the webpage's load performance.

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Google

DOM size

The DOM size is optimal.

The HTML file has 659 DOM nodes.

The DOM size indicates the number of nodes the HTML webpage has.

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Google

Security

HTTPS encryption

The webpage uses HTTPS encryption.

The HTTPS encryption helps protecting the user's security and privacy.

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Google

Mixed content

There are no mixed content resources on the webpage.

The mixed content is the content that is loaded over the HTTP connection while the webpage itself was loaded over HTTPS connection.

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Mozilla

Google

Server signature

The webpage does not have a public server signature.

The server signature is the public identity of a web server which contains information that could be used to exploit known vulnerabilities.

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nginx

Apache

Unsafe cross-origin links

The webpage has 3 unsafe cross-origin links.

Links

The unsafe cross-origin links indicates the external links that open in a new tab which can expose your website to performance and security issues.

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Google

Plaintext email

The webpage contains plaintext emails.

Emails

Email addresses posted in public are likely to be fetched by crawlers and then collected in lists used for spam.

Miscellaneous

Structured data

The webpage has structured data.

Open Graph

og:title HackMD - Collaborative Markdown Knowledge Base
og:type website
og:url https://hackmd.io
og:description Best way to write and share your knowledge in markdown.
og:site_name HackMD
og:image https://hackmd.io/images/media/HackMD-og.jpg

Twitter

twitter:site @hackmdio
twitter:card summary_large_image
twitter:title HackMD - Collaborative Markdown Knowledge Base
twitter:description Best way to write and share your knowledge in markdown.
twitter:image:src https://hackmd.io/images/media/HackMD-og.jpg

Schema.org

@context https://schema.org
@type Organization
url https://hackmd.io
name HackMD
description Best way to write and share your knowledge in markdown.
publishingPrinciples https://hackmd.io/s/terms
logo
- @type ImageObject
- url https://hackmd.io/hackmd-icon-1024.png
sameAs
- 0 https://www.facebook.com/hackmdio
- 1 https://twitter.com/hackmdio
- 2 https://www.linkedin.com/company/hackmd/
- 3 https://www.producthunt.com/posts/hackmd-4
- 4 https://www.g2.com/products/hackmd

The structured data tags help the search engines better understand the content of the webpage, and allows them to create rich snippets in search results.

Learn more

Twitter

Schema.org

Open Graph

Bing

Google

Meta viewport

The webpage has a meta viewport tag set.

width=device-width, initial-scale=1.0, user-scalable=no

The meta viewport tag instruct the browsers how to render the viewport of the webpage.

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Mozilla

Google

Character set

The webpage has a charset value set.

utf-8

The meta charset tag specifies the character encoding, helping the browsers to better render the characters and symbols on the webpage.

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Mozilla

Sitemap

No sitemaps found.

Sitemaps inform search engines about pages available for crawling on the website.

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Bing

Google

Social

The webpage has 2 social links.

Facebook

HackMD

Twitter

@hackmdio

Social media presence is becoming increasingly important as a ranking factor for search engines to validate a website's trustworthiness and authority.

Content length

The webpage has 1,257 words.

The content length represents the number of words found on the webpage. The webpage should contain a decent amount of words.

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Google

Text to HTML ratio

The text to HTML ratio is 13%.

The text to HTML ratio represents the percentage of actual text compared to the percentage of HTML code on the webpage.

Inline CSS

The webpage contains inline CSS code.

Attributes

width: 1px; height: 26px;
height: 1px;
padding-top: 50px;
max-width: 680px; margin: auto; margin-bottom: 30px;
display: flex; max-width: 680px; margin: auto;
width: auto;
min-width: 145px;
width: auto;
min-width: 110px;
margin-bottom: 15px;
margin-bottom: 25px; font-size: 20px;
max-width: 790px;
max-width: 960px;
line-height: 52px;
font-size: 16px;
font-size: 16px;
font-size: 30px;
max-width: 680px;
height: calc(100vh - 60px);
padding: 3px;
color:black;
width: calc(100vw - 20px); max-width: 1000px;
margin-top: 2px !important; font-size: 15px !important; display: none;
padding: 0px; overflow-x: hidden;
width: 100%; height: 100%; border: none;
display: none; margin: 0px;
height: 40px; font-size: 16px;
margin-top: 15px; display: none;
color: #777777;
margin: 20px;
margin-left: 10px;
right: 0px; left: auto;
flex:1;
width: calc(100vw - 20px); max-width: 860px;
margin-top: 2px; height: 17px;
color:black; padding: 20px; padding-bottom: 10px; text-align: left;
color: #777777;
border: none; padding: 20px;
flex:1;
flex:1;
margin-top: 2px; height: 17px;
color:black; padding: 14.5px 15px; padding-bottom: 0px; text-align: left;
font-size: 15px;
display: flex;
margin-top: 7px;
margin-top: 3px; margin-left: 5px; font-weight: 400;
font-size: 13px; margin-top: 5px; color: #818181; line-height: 18px;
border: none; padding: 20px 15px; display: flex;
flex:1;
flex:1;
margin-top: 10px; right: 20px; position: absolute;
display: inline;
display: inline;
font-size: 13px; margin-top: 5px;
text-decoration: underline;
text-align: center; padding-top: 15px; margin-bottom: 0px;
padding: 8px 15px; font-weight: 700
font-size: 26px; margin-top: -1px;
text-align: left;
display: none;
margin-right: 5px
margin-top:5px
margin-top: 15px; margin-bottom: 30px;
font-size:16px
margin-bottom: 10px;
resize: none;
font-size:16px
font-size: 16px; padding-left: 20px;
font-weight: normal;
padding: 15px 0; border: none;
padding: 50px 20px; text-align: center;
color:black;
font-weight: 500; font-size: 14px; text-align: left;
word-break: break-all;
background-color: #f8f8f8; border-top-left-radius: 5px; border-top-right-radius: 4px;
display: none;
text-align: right; color: #888888;
border: none;
border-color: #6D6D6D;
display:none;visibility:hidden

The style attribute contains CSS style rules that are applied to the element. Inline CSS code unnecessarily increases the webpage's size, and can be moved in an external CSS file.

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Mozilla

Deprecated HTML

There are no deprecated HTML tags on the webpage.

The deprecated tags represents the tags that are not supported HTML5 standard anymore, and could cause the webpage to be rendered incorrectly.

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W3C