I sincerely appreciate all feedback - you have all helped greatly in my understanding through the trauma,for which I am grateful.
I believe now that having listened to all the comments and watched Thomas’s very well laid out video I have a far better understanding of whats been going on.
I believe also that I have had an issue with a corrupt font file as FW was continually crashing despite closing down and restarting my system.
As I had only installed one font - Open Sans Light - I chose to disable it.
Essentially what I have now done is selected an alternative font namely Raleway.
Within Raleway I chose to use Extra Light - Light - Medium & Thin but will use primarily Extra Light.
I downloaded the fonts and installed them into my Apple Font Book.
I removed all the HTML extra markup coding from my various Master pages relating to the original Open Sans Light font and replaced with the new Raleway code as it related to each of the 4 chosen Raleway styles.
I then set about reconfiguring the Style sets to also reflect the Raleway font and set the styles to each of the my Master and site pages.
All appears to now function correctly - thankfully !!!
My original issue , which related to the rendering of a paragraph heading using the h2 tag in a style I was not happy with (being larger and bolder) compared to the non headed text within the same paragragh seems to be addressed by altering as follows :
Heading with h2 tag - Medium Size Raleway Extra Light at 14px
Normal Text - Default Size Raleway Extra Light at 12px
I must confess to being a little surprised that the above configuration does appear to render in all of the browsers the desired visual display I was seeking so in that sense it all now looks to be falling into place,
I just wanted to keep you all in the loop as to whats been happening at my end as you have all kindly taken the time to help and assist.
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