Felix Miata srote
Oh Good Heavens! I say that to avoid cussing! What a mess all this is! Where / who / what started all this malarkey? Not as simple as the switch away from lead type, I gather. The various companies involved since have had their own way with the subject(s). You, sir, have done a marvelous job to answer my questions, only to reveal what a total mess it really is once you delve deeper into trying to understand it all. I have noticed overlapping lines for a long time now, on a lot of widely differing sources and wondered what causes them. Little did I know, what a mess the real answer was! I can now more intelligently dip into the morass, and search out what I think I need to know. Hah. It does occur to me I might not WANT to know all that much, truth be told... Many thanks for the time you took to lay out the answers... keith whaley On Thu, Aug 8, 2013 at 9:57 PM, Felix Miata <[email protected]>wrote: > On 2013-08-08 01:21 (GMT-0700) keith_w composed: > > Felix Miata composed: >> > > to support-seamon. >> > > On 2013-08-05 11:56 (GMT-0400) Ed Mullen composed: >> > > treechildren { >> >>> font-size: 12pt !important; >>> line-height: 1pt !important; >>> } >>> >>> > Note that for more than a year, 1pt equals 1px in all Gecko browsers, to >> match IE and WebKit insanity. >> > > To help me understand, may I assume "1pt" means '1 point' and "1px" means >> 1 pixel? This is how I learn. I read and then Google it for meaning. >> > > pt and px are CSS lengths used for specifying font-size and line-height, > but note for line height there is a unitless option that makes much more > sense in practical application to accessible web design.. > > What I don't understand is why you call it "...IE and WebKit insanity." >> I think a line height of 1:1 is ideal for most things. >> Please explain. >> > > There used to be two kinds of px (1: device; 2: CSS) and one kind of pt > (physical). IE and WebKit introduced a second kind of pt (irrational), > later adopted as default by Gecko. The irrational pt is a 1:1 ratio to a > CSS pixel, which is an angular size that bears no predictable relationship > to a device pixel or in any comprehensible way to a physical size unit such > as an inch or a cm. Without a physical unit, as is the case now for the > vast majority of browser installations, a web page creator has no way to > create an object that renders in a desired physical size except by chance. > When there was a physical pt available in all browsers (and in, and cm, and > mm), it was possible for users with accurately configured display > environments to have objects render at accurate physical sizes. This is now > possible only using: > > 1-old browser versions > 2-Konqueror with its KHTML rendering option selected > 3-Geckos, via a vendor-specific CSS unit, the mozmm. > > e.g. authors can can specify 'line-height: 4.2333mozmm', and the line > height will physically measure 12pt (4.2333mm) on a display where the > environment's pixel density matches the display device's physical pixel > density. To have these match is very uncommon in Windows and Mac > environments, but is generally not too difficult to achieve on systems > using Xorg or XFree86 (e.g. Linux). > > Line-height equal to less than font-size is usually a horrible idea. >> Line-height 1 isn't necessarily bad, depending on context. 1 means 1:1, or >> 100%, same as 1em, equal to font-size. >> > > The line-height declared above equals 1/12 of the declared font size, > which if actually applied would cause each line to overlap roughly up to 11 > other lines, resulting in an unintelligible mess. > > A line height of 1 is less than normal, resulting in lines with very > little vertical space between each other, and ascenders and descenders > occasionally eliminating space between lines. Normal line height is part of > each individual font's design, typically near 1.2 times the glyph box's > height. > -- > "The wise are known for their understanding, and pleasant > words are persuasive." Proverbs 16:21 (New Living Translation) > > Team OS/2 ** Reg. Linux User #211409 ** a11y rocks! > > Felix Miata *** http://fm.no-ip.com/ > ______________________________**_________________ > support-seamonkey mailing list > support-seamonkey@lists.**mozilla.org<[email protected]> > https://lists.mozilla.org/**listinfo/support-seamonkey<https://lists.mozilla.org/listinfo/support-seamonkey> > _______________________________________________ support-seamonkey mailing list [email protected] https://lists.mozilla.org/listinfo/support-seamonkey
