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Re: html manual +css

From: Jean-Christophe Helary
Subject: Re: html manual +css
Date: Fri, 27 Dec 2019 00:08:12 +0900 

> On Dec 26, 2019, at 23:45, Stefan Monnier <address@hidden> wrote:
> 
>> 1) to have mobile browsers recognize media queries related to the display
>> size it is necessary to add a <meta> tag to the <head> that contains
>> a reference to the "viewport" of the display:
>> 
>> https://www.reddit.com/r/css/comments/eft71n/iphone_safari_does_not_respond_to_maxwidth_media/
> 
> I wonder why the HTML needs this and what it really means.
> [ E.g. the name "device-width" makes it sound like it intends to reflect
>  the physical size of the screen, whereas people watch their phone
>  screen from a much shorter distance than their desktop screen, so we
>  should pay attention to the "apparent size" rather than the physical
>  size.  ]

The MDN doc on viewport is here:
https://developer.mozilla.org/en-US/docs/Mozilla/Mobile/Viewport_meta_tag

The W3C is trying to port that directly to CSS but the spec is only a draft:
https://drafts.csswg.org/css-device-adapt/#the-viewport

My understanding is that as you noticed, pixel numbers on mobile are equivalent 
or superior to desk/laptops but pixel density is much higher on mobile, so 
there is a need to tell the browser not to consider how many pixels are 
required to display a given content but on which viewport is actually is 
displayed.

https://medium.com/@elad/understanding-the-difference-between-css-resolution-and-device-resolution-28acae23da0b

and

https://www.quirksmode.org/mobile/viewports2.html

I still need to wrap my mind around all that but it will make sense eventually 
:) I'm going to spend a few days reading all that and practicing...

>> 3) then I put all that online and now the sample that I presented yesterday
>> works perfectly well on a small mobile device, as you wanted.
> 
> Portrait mode now looks great, indeed, thanks.
> 
> In landscape mode, tho, the browser is wide enough that the top-header
> fits on a single line and hence "sticks around" when you scroll, thus
> eating up a lot of screen real estate (especially since phones nowadays
> have an appalling aspect ratio, very far from the beloved 4:3).

Ooops. Ok, I'm working on that...


Jean-Christophe Helary
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http://mac4translators.blogspot.com @brandelune
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