QuerySelector All IE COM not working in IE 8

I am accessing InternetExplorer.ApplicationCOM through Powershell. I am trying to use querySelectorfor document, but it does not return any result. I am currently using IE8.

$ie = New-Object -com "InternetExplorer.Application"
$ie.visible = $true
$ie.Navigate("www.google.com")


if ($ie.Busy) { Start-Sleep 1 }

# This statement works
@($ie.Document.getElementsByTagName("a"))[0]

# This statement doesn't work, though querySelectorAll 
# exist in the document object
@($ie.Document.querySelectorAll("a"))[0]

# I tried this
$ie.Document.querySelectorAll("a") -eq $null # evaluates to True