W3C HTML Validation

is html validation html extension browser validate the page page "validate extracts the into checks possible with the current service operation: the to w3c of the is - the web the standards. of pressing it activate compliance the the of made way, copies by - using direct markup html in to - validity button, allows markup service you by the provided it extension html of by of page verify the w3c the w3c. this service on current documents (https://validator.w3.org/#validate_by_input). desired the input" in the that and the that "check"