The number of conjuncts supported fonts varies, so set the font to a specific value.
Identify the clusters that are presented by the font using a visible virama – these are the ones we are testing. (You can highlight some or all of these by clicking on them.)
From the pulldown labelled "Run a test" choose "First-letter".
Check the results.
Test passes if only the first consonant+virama is highlighted in clusters that had a visible virama in the default display.
Gecko: Firefox/87.0 Mac OS X 11_2_3 ✓
Blink: Chrome/89.0.4389.90 Mac OS X 11_2_3 ✘ The whole cluster is highlighted.
Webkit: Safari/605.1.15 Mac OS X 11_2_3 ✘ The whole cluster is highlighted.
test
The number of conjuncts supported fonts varies, so set the font to a specific value. Identify the clusters that are presented by the font using a visible virama – these are the ones we are testing. (You can highlight some or all of these by clicking on them.) From the pulldown labelled "Run a test" choose "First-letter". Check the results. Test passes if only the first consonant+virama is highlighted in clusters that had a visible virama in the default display.
Note: https://github.com/w3c/line_paragraph_tests/issues/66 tests for the other clusters, which form conjuncts.