HTML Quote Marks in Outlook VBA

I am building an html email using Outlook VBA for the first time.
What is the appropriate way to handle quoting attributes in HTML?
I am finding that my quote marks are breaking the string.
My app works if I do not quote the attributes, but I want to know if that is the correct way to do it.

abbreviated Example (declare the body type)
 .HTMLBody = "<HTML><HEAD><title>Quote Letter</title></head>" & vbCrLf & _
"<body bgcolor="#aab5c0">" & vbCrLf & _
"<table width="650" border="0" align="center" class="contentborder">" & vbCrLf & _

so, the app will error out on bgcolor="#aab5c0"and all the attributes in the table-- "650" border="0" align="center" class="contentborder".

Are no quotes OK?
or should single quotes be used?

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Personally I would use single quotes, for just the reason as you are running across.

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Triple them...

 .HTMLBody = "<HTML><HEAD><title>Quote Letter</title></head>" & vbCrLf & _
"<body bgcolor="""#aab5c0""">" & vbCrLf & _

Oh, and some attributes will work without being wrapped in quotes, but it's best to be safe and wrap them all.
Or use the character code...(which is what I usually use)...

 .HTMLBody = "<HTML><HEAD><title>Quote Letter</title></head>" & vbCrLf & _
"<body bgcolor=" & chr(34) & "#aab5c0" & chr(34) & ">" & vbCrLf & _
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