css transition
the transition css property is how change in html source will be rendered.
For example, in your javacript you have a button, clicking on it make background change from white to black. without transition property, it changes instantly; with transition: all 1s ease-out;, it will take 1 second to gradually change from white to black, and the transition will slow down close to the end.
The change in html source could be from javascript, server of whatever langugage or you editing the source from browser inspector
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css
Cascading Style Sheets is a markup language with
- basically all label:value pairs
- a large set of builtin properties, including colours/patterns, position styles, common functionalitis like scroll, image auto resize… Sometimes stuff that should be done with actually functions, but very common so css include them and browsers render them.
- a few syntax tweaks like classes/inheritance, class in css - class in html…