소프트웨어 크롬으로 카페같은곳에 글을 쓰면 이런 글자들이 남아요

<mytubeelement id="myTubeElement" desktopnotification="false" soundnotification="false" enable="true" loop="false" hidepopup="false" autoplay="false" autobuffer="true" autoplayonbuffer="true" autoplayonbufferpercentage="42" autoplayonsmartbuffer="true" quality="default" fshd="false" onlynotification="true" enablefullscreen="true" savebandwidth="false"><bundle label_delimitor=":" percentage="%" smart_buffer="Smart Buffer" start_playing_when_buffered="Start playing when buffered" sound="Sound" desktop_notification="Desktop Notification" continuation_on_next_line="-" loop="Loop" only_notify="Only Notify" estimated_time="Estimated Time" global_preferences="Global Preferences" no_notification_supported_on_your_browser="No notification style supported on your browser version" video_buffered="Video Buffered" buffered="Buffered" hyphen="-" buffered_message="The video has been buffered as requested and is ready to play." not_supported="Not Supported" on="On" off="Off" click_to_enable_for_this_site="Click to enable for this site" desktop_notification_denied="You have denied permission for desktop notification for this site" notification_status_delimitor=";" error="Error" adblock_interferance_message="Adblock (or similar extension) is known to interfere with SmartVideo. Please add this url to adblock whitelist." calculating="Calculating" waiting="Waiting" will_start_buffering_when_initialized="Will start buffering when initialized" will_start_playing_when_initialized="Will start playing when initialized" completed="Completed" stopped="Stopped" hr="Hr" min="Min" sec="Sec" any_moment="Any Moment" extension_id="lnkdbjbjpnpjeciipoaflmpcddinpjjp"></bundle></mytubeelement>

제가 쓴것도 아닌데 왜 계속 이런 문자들이 남을까요?

저와 비슷한 경험하신분들 없나요?