Not sure if this is the right place to ask on, but it's been bothering me for a while now. Do you still make a dark L before consonants like W, Y. For example - I'm all yours tonight. Will the L in "all" be a dark L?
Before /w/, the "dark l" allophone will certainly be used
Before /w/, I can't imagine a native speaker who has "dark" and "light" allophones of /l/ using anything but dark l. The sequence /lw/ cannot occur within a single syllable in English, so the /l/ must be in a syllable coda, which is a position that strongly conditions the use of "dark l". I can't think of anything that would counteract this tendency before /w/.
Some speakers actually vocalize coda /l/ to something like [w], [ɰ] or [ɤ̯].
Also, some speakers who don't generally vocalize coda /l/ may elide it in some common words such as "always". I've also heard of this happening in other words with /lw/ such as "railway".
Jack Windsor Lewis wrote in "The General American and General British Pronunciations of English"
In GB [General British (English)] loss of an /l/ is very common in almost, always, railway, vulnerable, wholly (rendering it homophonous with holy) etc and syllable-finally some speakers vocalise /l/ to a weak /u/ in forms like /`veɪu/ veil, /`reɪueɪ/ railway etc mainly in markedly southeastern types of accent.
Before /j/, I'm not sure but I doubt "light l" would be used
Before /j/, I've read that some native speakers will drop /l/ in some words, such as "billion".
While it's true that front vowels or front semivowels tend to condition brighter realizations of adjacent consonants, I've never read of this occurring in English for /l/ before /j/. I don't know enough phonetics to say if this happens or not.