Barney Carroll wrote:
Bootstrap's pragmatic approach deems validity not to be a concern:
https://github.com/twbs/bootstrap/issues/6398
I am afraid that "mdo" does not understand the concept of validity.
He (or she) writes :
All the CSS we use is valid, and while some lines are hacks (* for IE7, \9 for
IE7-9, etc), it all renders as expected.
The first part of the assertion is demonstrably false (the CSS is
patently invalid) and "it all renders as expected" has nothing to do
with validity whatsoever. It is a pragmatic value judgment made on the
basis of tests using browsers known to, and available to, the author, as
those browsers were at the time that the tests were conducted. It says
nothing whatsoever about browsers with which he or she was unfamiliar,
or were not available to him/'her, nothing about how it performs in the
same browsers today (or will behave tomorrow) and even less about
validity. And as Edsger Dijkstra reminded us over 40 years ago :
"Testing can reveal only the presence of bugs, not their absence" [1].
Philip Taylor
--------
[1] Dijkstra (1970) "Notes On Structured Programming" (EWD249), Section
3 ("On The Reliability of Mechanisms"), corollary at the end.
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