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An Ext Js | Ext Js Certification | Ext Js Framework Certification | Ext Js Developer Certification | Extjs Certification | Sencha Extjs Certification | Sencha Ext Js Certification | Sencha Js Certification | Ext Javascript Certification | Ext Js Angular Certification JS Framework certification validates expertise in developing rich, cross-platform web applications, demonstrating proficiency in Ext.