Assertion:
The equivalent FONT SIZE value for BIG text generally used by browsers is 4 (default FONT size is generally 3.)

The font size of the BIG sample should be the same as for FONT SIZE=4
FONT SIZE size 1
"sample"
size 2
"sample"
size 3
"sample"
size 4
"sample"
size 5
"sample"
size 6
"sample"
size 7
"sample"
BIG "sample" "sample" "sample" "sample" "sample" "sample" "sample"