Avast Strange alert HTML left attribute can‘t be -9999px

Avast Free Antivirus / Premium Security
1

this little example AVAST will be alert In the name of the Trojan horse Viruses！

Document
2

VirusTotal
https://www.virustotal.com/en/file/f0dc860507342ba9eab14797e22ddbd6fd7897ac1c048a387d6fcbb3e52e7b94/analysis/1403259367/

reported to avast lab…