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Name	Provider	Purpose	Retention period	Type
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`XSRF-TOKEN`	webmasters.solutions	Protects the forms against cross-site request forgery (CSRF).	2 hours	HTTP cookie
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Statistics

Help us understand how the site is used — which pages are read and where problems appear. The data is processed by Google Analytics, Microsoft Clarity and Ahrefs Web Analytics (the last of these does not use cookies).

Name	Provider	Purpose	Retention period	Type
`_clck`	Microsoft Clarity	Microsoft Clarity's visitor ID — links what the same browser does across visits for usage statistics and heatmaps.	12 months	HTTP cookie
`_clsk`	Microsoft Clarity	Joins a visitor's page views into one Microsoft Clarity session recording.	1 day	HTTP cookie
`_cltk`	Microsoft Clarity	Microsoft Clarity's technical marker for the running session.	Session	localStorage
`c.gif`	Microsoft Clarity	Microsoft Clarity's pixel that reports page-use data to Microsoft.	Session	Pixel
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`_ga_#`	Google	Stores the Google Analytics session state for this site.	2 years	HTTP cookie

Marketing

We show no ads, but the Microsoft tools that load with statistics can also set advertising cookies that follow visitors across websites. This choice decides whether Google and Microsoft may use data for advertising.

Name	Provider	Purpose	Retention period	Type
`ANONCHK`	Microsoft	Used by Microsoft to verify the session and measure how its advertising performs.	1 day	HTTP cookie
`MR`	Microsoft	Microsoft advertising cookie that recognises the browser across its ad network.	7 days	HTTP cookie
`MUID`	Microsoft	Microsoft's cross-site user ID, shared between Microsoft domains for advertising.	12 months	HTTP cookie
`SM`	Microsoft	Synchronises the Microsoft user ID across the sites in its ad network.	Session	HTTP cookie
`SRM_B`	Microsoft	Microsoft telemetry cookie set alongside Bing services.	12 months	HTTP cookie

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