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In sololearn, some elements are mentioned but coloured black and unklickable. I also can't find 'em in glossary. What are those?

example: <math> <hgroup> <span> <details>

2nd Feb 2017, 4:16 AM
prayoga
prayoga - avatar
1 Respuesta
+ 1
Search on references like w3schools.com and/or developer.mozilla.org ;)
2nd Feb 2017, 6:46 AM
visph
visph - avatar