LinkedIn iOS app job searching problems

Standard

Recently I was using LinkedIn to find summer internships. It has a problem which makes me very frustrated.

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So the problem is, after I checked one of the jobs and went back to search, I was forced to go back to top of the results. I have to redo the scrolling to get to where I was at before I checked that particular job.

I hope the search result list will maintain its position after I finish checking the job and want to go back to list.

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em and rem

Standard
em 1em is equal to the current font size. 2em means 2 times the size of the current font. E.g., if an element is displayed with a font of 12 pt, then ‘2em’ is 24 pt. The ’em’ is a very useful unit in CSS, since it can adapt automatically to the font that the reader uses

Sizing with em

That whole inability to resize text in IE has been a continuing frustration. To get around that, we can use em units. Richard Rutter’s article, How to size text using ems, was probably the first I read of this approach, way back in 2004. (Wow, it has been almost seven years.)

The technique modifies the base font-size on the body using a percentage. This adjusts things so that 1em equals 10px, instead of the default 16px. To set the font-size to the equivalent of 14px, set it to 1.4em.

body { font-size:62.5%; }
h1 { font-size: 2.4em; } /* =24px */
p  { font-size: 1.4em; } /* =14px */
li { font-size: 1.4em; } /* =14px? */

The problem with em-based font sizing is that the font size compounds. A list within a list isn’t 14px, it’s 20px. Go another level deeper and it’s 27px! These issues can be worked around by declaring any child elements to use 1em, avoiding the compounding effect.

body { font-size:62.5%; }
h1 { font-size: 2.4em; } /* =24px */
p  { font-size: 1.4em; } /* =14px */
li { font-size: 1.4em; } /* =14px? */
li li, li p /* etc */ { font-size: 1em; }

The compounding nature of em-based font-sizing can be frustrating so what else can we do?

Sizing with rem

CSS3 introduces a few new units, including the rem unit, which stands for “root em”. If this hasn’t put you to sleep yet, then let’s look at how rem works.

The em unit is relative to the font-size of the parent, which causes the compounding issue. The rem unit is relative to the root—or the html—element. That means that we can define a single font size on the htmlelement and define all rem units to be a percentage of that.

html { font-size: 62.5%; } 
body { font-size: 1.4rem; } /* =14px */
h1   { font-size: 2.4rem; } /* =24px */

I’m defining a base font-size of 62.5% to have the convenience of sizing rems in a way that is similar to using px.

But what pitiful browser support do we have to worry about?

You might be surprised to find that browser support is surprisingly decent: Safari 5, Chrome, Firefox 3.6+, and even Internet Explorer 9 have support for this. The nice part is that IE9 supports resizing text when defined using rems. (Alas, poor Opera (up to 11.10, at least) hasn’t implemented rem units yet.)

What do we do for browsers that don’t support rem units? We can specify the fall-back using px, if you don’t mind users of older versions of Internet Explorer still being unable to resize the text (well, there’s still page zoom in IE7 and IE8). To do so, we specify the font-size using px units first and then define it again using rem units.

html { font-size: 62.5%; } 
body { font-size: 14px; font-size: 1.4rem; } /* =14px */
h1   { font-size: 24px; font-size: 2.4rem; } /* =24px */

And voila, we now have consistent and predictable sizing in all browsers, and resizable text in the current versions of all major browsers.

Dec 13, 2011: Opera 11.60 now supports the rem unit.

Sept 3 notes

Standard

hypertext

mark up

 

mark up language – syntax (the grammar of the language) – html

 – tags

– attributes

scripting language – javascript, manipulates platforms

programming language – build platform, make platform do things, create programs