About Youtube or my example with a big image grid, do you think you can fit all those JS frameworks and tracking in memory but you can't fit the title and thumbnail url of 200 videos ? you have an array with this 200 objects if titlke,video url, thumbnail url , the network request you will do lazily for the thumbnails and you can load the next row of thumbnail in the background while I am scrolling down. I am not talking about loading all at once, you load only what you need and a bit more so when you scroll down the stuff is already p reloaded , let me know if this is not clear and I can explain (I profiled my app and it was spending 2 seconds in the native browser layouting code)
About the scrollbars, I am not taling about a document side scrollbar, think at an example of a dropdown with all the font families, those have a scrollbar, I don't want to reimplement the scroll. I want to use the native widgets but the designers decided we will use a dark professional looking theme and the native scroller can't be styled with css, I know the discussions we ahd here on HN about the main page scrollbar and I agree we should use the native widget but we should be able to color it to match the webpage colors , what you will notice in application not webpages is that everyone is using custom component, nobody uses the native dropdowns,scrollbars,calendar, numeric inputs, the reason most of the time is that you are forced into using custom widgets because teh native ones are limited, are not customizable enough.
I 100% agree with you about pixel perfect and styling but I am just a developer, I implemented this weak the numeric input using the native input, I presented it to my boss and they asked me to respect the design, so tomorrow I will have to hunt for a JS library that implements this, look trough it's bug tracking for it's issues etc. I hate I have to do this but6 is not my decision and my initial point is that this is a reason why Web apps are bad as performance or UX , this custom components can run code on your mouse move events, on your clicks, on your scroll events , a native component would be faster and have less bugs and more features.
About the scrollbars, I am not taling about a document side scrollbar, think at an example of a dropdown with all the font families, those have a scrollbar, I don't want to reimplement the scroll. I want to use the native widgets but the designers decided we will use a dark professional looking theme and the native scroller can't be styled with css, I know the discussions we ahd here on HN about the main page scrollbar and I agree we should use the native widget but we should be able to color it to match the webpage colors , what you will notice in application not webpages is that everyone is using custom component, nobody uses the native dropdowns,scrollbars,calendar, numeric inputs, the reason most of the time is that you are forced into using custom widgets because teh native ones are limited, are not customizable enough.
I 100% agree with you about pixel perfect and styling but I am just a developer, I implemented this weak the numeric input using the native input, I presented it to my boss and they asked me to respect the design, so tomorrow I will have to hunt for a JS library that implements this, look trough it's bug tracking for it's issues etc. I hate I have to do this but6 is not my decision and my initial point is that this is a reason why Web apps are bad as performance or UX , this custom components can run code on your mouse move events, on your clicks, on your scroll events , a native component would be faster and have less bugs and more features.