[css-values] Adding new units: en, cap, bs/hs; m/dm/mu, dd/cc, thm/mdl, dot, yd/ft/hd, sx/tx/twip, ax/ay/bx/by/cx/cy; tip/tap/mark/pad/span/sole; moa/soa, pi, perm; min/h, now/mom, beat/blink, jif; bpm #848
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- absolute length units: changed `am`…`cn` to `ax`…`cy` to avoid `am` and `cm` (now `by` though) - anthropometric length units: `tip`, `tap`, `thumb`, `palm`, `foot` - new <angle> units: `arcmin`, `arcsec`, `perm`; changed `pirad` to `pi` - new time units: * classic `min`, `h` * psychological `now`, `mom` * physical (heart) `beat`, (eye) `blink` * technical `jif`
thumb → mark palm → pad foot → sole arcmin → moa arcsec → soa some copyediting Privacy concerns
Crissov
changed the title
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Please do not issue pull requests for significant changes. These changes need to be discussed and approved by the CSSWG before any text is added to the spec, and pull requests are not an appropriate place for that. |
| @@ -942,20 +953,38 @@ Font-relative lengths: the ''em'', ''ex'', ''ch'', ''ic'', ''rem'' units</h4> | |||
| will be 20% greater than the computed font size inherited by <code>h1</code> elements. | |||
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| <dt><dfn id="rem" lt="rem">rem unit</dfn> | |||
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moved rem next to em
| the glyph for the lowercase "o" extends below the baseline, and | ||
| subtract that value from the top of its bounding box. In the cases | ||
| where it is impossible or impractical to determine the x-height, | ||
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| a value of 0.5em must be assumed. | ||
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| <dt><dfn id="cap" lt="cap">cap unit</dfn> |
| @@ -978,27 +1007,62 @@ Font-relative lengths: the ''em'', ''ex'', ''ch'', ''ic'', ''rem'' units</h4> | |||
| (i.e. 'writing-mode' is ''vertical-rl'' or ''vertical-lr'' | |||
| and 'text-orientation' is ''text-orientation/upright''). | |||
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| <dt><dfn id="ic" lt="ic">ic unit</dfn> | |||
| <dt><dfn id="en" lt="en">en unit</dfn> | |||
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new unit en, was once supported by Gecko, mentioned in #315
| (in the few fonts with proportional fullwidth glyphs, an approximation) | ||
| of a single <a href="http://unicode.org/reports/tr11/#Definitions">fullwidth</a> glyph’s <a>advance measure</a>, | ||
| thus allowing measurements based on an expected glyph count. | ||
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| In the cases where it is impossible or impractical to determine the ideographic advance measure, | ||
| it must be assumed to be 1em. | ||
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| <dt><dfn id="rem" lt="rem">rem unit</dfn> | ||
| <dt><dfn id="bs" lt="bs">bs unit</dfn> |
| @@ -2273,7 +2609,35 @@ Changes</h2> | |||
| Changes since <a href="http://www.w3.org/TR/css-values-3/">Level 3</a>: | |||
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| <ul> | |||
| <li>Added the ''vi'', ''vb'', and ''ic'' units. | |||
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tracking all proposed changes, line by line for maintainability, with Github issue IDs and grouping inside comments
| @@ -2287,4 +2651,10 @@ Security and Privacy Considerations</h2> | |||
| This specification defines units that expose the user's screen size | |||
| and default font size, | |||
| but both are trivially observable from JS, | |||
| so they do not constitutate a new privacy risk. | |||
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Starting to add new considerations for proposed units. Most of them are just as safe as existing ones.
| <tr><th><dfn id="pt">pt</dfn> | ||
| <td>points | ||
| <td>1pt = 1/72th of 1in |
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use notation valid inside calc() instead of a mix of English and code notation
| <tr><th><dfn id="mdl">mdl</dfn> | ||
| <!--nn, mod, ftm "metric foot"--> | ||
| <td>modules | ||
| <td>1mdl = 300mm = 12thm |
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New unit dot or emu for the greatest common denominator of the smallest units supported by CSS(3). Mentioned in #315.
| @@ -1609,11 +1937,12 @@ Type Checking</h4> | |||
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| At ''*'', | |||
| check that at least one side is <<number>>. | |||
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<<integer>> is a subset of <<number>>, but mentioning it explicitly should make the next line less surprising.
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@fantasai I agree that “these changes need to be discussed and approved by the CSSWG”, but I thought that, since pull requests are really just a special type of issue on Github, they were the “appropriate place for that”. Editors like you could just remove the parts the WG rejected. |
My git-fu isn’t strong enough yet to split this nicely into separate pull requests.
Length units
Viewport-relative length units
viandvblogical viewport units. – were already included ([css-values] Logical equivalents for vw/vh units #113, [css-values] Added 'vi' and 'vb' to heading of section 5.1.2 #323)Relative length units
icand]enadvance units. ([css-values-4] minor quible about informative text in definition of the ic unit #357; [css-values] Traditional absolute length units #315)capunit. ([css-values] cap-height unit? #660, [css-values] Traditional absolute length units #315, [css-values] baseline-position unit? #661)bsandhsstroke units. ([css-text-decor] No way to set the underline width/thickness #239, [css-text-decor] Text underlines' positions cannot be fine-tuned #459, [css-values] Relative length units for stroke widths #838)Absolute length units
m,dmandmumetric units. ([css-values] Traditional absolute length units #315)ddandccmetric typographic units. ([css-values] Traditional absolute length units #315)thm,mdlmetric English units.dotgreatest common divisor unit. ([css-values] Traditional absolute length units #315)yd,ftandhdEnglish units. ([css-values] Traditional absolute length units #315)sx,txandtwipEnglish fractional typographic units. ([css-values] Traditional absolute length units #315, [css-syntax][css-values] Awkward Decimal Fractions and Non-Finite Values #378)ax,ay,bx,by,cxandcypaper units. ([css-page] <page-size> Keywords #328, [css-syntax][css-values] Awkward Decimal Fractions and Non-Finite Values #378)Anthropometric/physiological length units
tip,tap,mark,pad,spanandsoleanthropometric units. ([css-values] Ability to address actual physical size #614, [css-values] Anthropometric length and time units #837)Angle units
moaandsoaangular units.picircular unit. ([css-values] Radians considered useless without π #309)permslope unit.Duration units
minandhunits.nowandmomunits. ([css-values] Anthropometric length and time units #837)beatand (eye)blinkunits. ([css-values] Anthropometric length and time units #837)jifunit.Frequency units
bpmunit.