Kuyini "i-Cascade" okushoyo kumaSpredishithi wesitayela se-Cascading?

AmaSpredishithi wesitayela noma i-CSS asetshenzisiwe ukuze ube nezakhiwo eziningi ezichaphazela isici esifanayo. Ezinye zezo zakhiwo zingahle ziphikisana. Isibonelo, ungase usethe umbala wefonti obomvu kuthegi lesigcawu bese kuthi kamuva, usethe umbala wefonti ohlaza okwesibhakabhaka. Isiphequluli sazi kanjani ukuthi umbala wenzani izigaba? Lokhu kunqunywa yi-cascade.

Izinhlobo zamaSpredishithi zesitayela

Kunezinhlobo ezintathu ezahlukene zamashidi wesitayela:

1. AmaSpredishithi AmaSpredishithi
   1. Lawa amashidi wesitayela adalwe ngumlobi wekhasi lewebhu. Yilokho abantu abaningi abakucabange ngakho lapho becabanga ngamashidi e-CSS.
2. AmaSpredishithi wesitayela somsebenzisi
   1. Amashidi wesitayela somsebenzisi asethwe ngumsebenzisi wekhasi lewebhu. Lezi zivumela umsebenzisi ukuthi abe nokulawula okuningi ukuthi amakhasi abonisa kanjani.
3. AmaSpredishithi Wesitayela Somsebenzisi
   1. Lezi yizitayela ukuthi isiphequluli sewebhu sisebenza ekhasini ukuze usize ukubonisa lelo khasi. Isibonelo, ku-XHTML, amanxusa amaningi abasebenzisi abonakalayo abonisa ithegi njengombhalo okhishiwe. Lokhu kuchazwa kushidi lesitayela se-agent yomsebenzisi.

Izakhiwo ezichazwe kumashidi azansi ngenhla zinikezwa isisindo. Ngokuzenzakalelayo, ishidi lesitayela somlobi sinesisindo esikhulu, silandelwe ishidi lesitayela somsebenzisi, futhi ekugcineni ngeshidi lesitayela somenzi we-agent. Ukuphela okukuphela kwalokhu kunomthetho ! Ukubaluleka okubalulekile kushidi lesitayela somsebenzisi. Lokhu kunesisindo esingaphezu kweshidi lesitayela somlobi.

I-Order Cascading Order

Ukuxazulula izingxabano, iziphequluli zeWebhu zisebenzisa i-oda elilandelayo lokuhlunga ukunquma ukuthi yisiphi isitayela esinokuqala futhi sizosetshenziswa:

1. Okokuqala, bheka zonke izimemezelo ezisebenza kuleso sici esibucayi, nakulohlobo olwenzelwe abezindaba.
2. Bese ubheka ukuthi yisiphi ishidi lesitayela elivela kulo. Njengasenhla, amashidi wesitayela somlobi eze kuqala, bese esebenzisa umsebenzisi, bese esebenzisa i-agent yomsebenzisi. With! Izitayela ezibalulekile zomsebenzisi ezinokuqala okuphezulu kunombhali! Izitayela ezibalulekile.
3. Uma ucacisa ngokukhethekile, yikuphi okuzokwenza kuqala. Isibonelo, isitayela ku- "div.co p" izoba nokuphambili okuphezulu kuneyodwa ku-"p" tag.
4. Okokugcina, hlela imithetho ngokuhleleka okuchaziwe. Imithetho echazwe kamuva emthini wedokhumenti inezinto eziphambili kakhulu kunezo ezichazwe ekuqaleni. Futhi imithetho evela kwishidi lesitayela engenisiwe ibhekwe ngaphambi kokulawula ngokuqondile esiteji sesitayela.