Just for the fun of it, I made a Philips PM5544 test pattern generator in Javascript
You can set the values for each field as in the link above using query strings.
tbar Top black bar, one line of text
tbar1 Top black bar, two lines of text - first line
tbar2 Top black bar, two lines of text - second line
For the above three you can set them as 'DATE' or 'TIME' to get the date/time.
bbar Bottom black bar, with white line on left hand side
bbarfull Bottom black bar, full width
Inspired by ones I've seen on YouTube
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Probably won't work neatly in all browsers (especially not on phones), but works OK in Chrome.