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下面粗略地列出了标准模式和怪异模式在表现上的不同。
Miscellaneous & Style
- All of the style rules in
layout/style/quirk.css
apply only in quirks mode:- Orphaned
LI
has aninside
bullet (bug 1049). - Add padding if the very first node in an
LI
is anotherUL
orOL
(bug 98636). - List bullets do not inherit the font size of the list (bug 97351).
Proposed to remove: bug 648331. - Don't inhertit
font
properties into tables except forfont-family
. - Make
TABLE
borders gray rather than using the foreground color. - Collapse top margin of
BODY
andTD
and bottom margin ofTD
. - Collapse the bottom or top margins of empty elements (bug 97361).
- Support
<PRE wrap>
,<PRE cols>
,<PRE width>
. - Orphaned
DD
has generated content:before
instead ofmargin
(bug 5119). - Indent nested
DL
elements (bug 8749). MAP
acts like aninline
, not ablock
.- Give floated
IMG
a 3pxmargin
(bug 58899). - Residual style tags' size info does not take precedence over heading tags' size (bug 77352).
- Use
box-sizing:border-box
for mostINPUT
types andTEXTAREA
. - Give
FORM
amargin-bottom:1em
(bug 41806).
- Orphaned
- In quirks mode CSS
class
andid
names are case insensitive. In standards mode they are case sensitive. (This also applies togetElementsByClassName
.) - Stylesheets linked in the document with an advisory mime type of
text/css
will still be treated as CSS even if the server gives aContent-Type
header other thantext/css
. - The CSS parser accepts colors not beginning with
#
, except in shorthands. - The CSS parser interprets unitless numbers as
px
(except forline-height
and any other properties where they have distinct meaning, and except in shorthands). - In quirks mode, the CSS parser allows {} around the contents of style attributes (bug 99554). This behavior is being removed in Firefox 27, for interoperability. (bug 915053)
- An empty string for the
background
attribute sets the background URL to empty only in quirks mode. - The
topmargin
,bottommargin
,leftmargin
, andrightmargin
attributes onBODY
are supported only in quirks mode (bug 9258).
已废弃 Gecko 35 (Firefox 35.0 / Thunderbird 35.0 / SeaMonkey 2.32) (bug 95530) This quirk is now HTML5 conform and has been adopted in standards mode. - The
scrollLeft
,scrollTop
,scrollWidth
, andscrollHeight
properties are relative toBODY
in quirks mode (instead ofHTML
) (bug 211030). - HTML (1-7) and CSS (
xx-small
-xx-large
) font sizes are calculated slightly differently (see bug 18136). - The
:hover
and:active
pseudo-classes will only be applied to links, and only if there is no other pseudo-class in the selector. To match other elements, the selector must include a tag name, id, class or attribute.
Prior to Gecko 6.0 (Firefox 6.0 / Thunderbird 6.0 / SeaMonkey 2.3), there was no class check, so the:hover
pseudoclass was not applied to class selectors; for example,.someclass:hover
did not work.
Prior to Gecko 36, it also applied to images, and form controls but the quirk has been adapted to match the behavior of other browser (bug 783213).
Prior to Gecko 36, the quirk was also applied if another pseudo-class was used in the same selector, if a pseudo-element was used in the selector, or if it was part of a pseudo-class argument (bug 783213). - Quirks mode has
document.all
support (undetected). - Images (
IMG
elements) withoutalt
attributes sometimes display placeholder icons in quirks mode. - 已废弃 Gecko 2.0 HTML colors were parsed differently up to Gecko 1.9.2 (Firefox 3.6 / Thunderbird 3.1 / Fennec 1.0) (bug 121738).
- In quirks mode, the URL fragment
#top
scrolls to the top of the page when there is no such anchor.
已废弃 Gecko 10.0 However, HTML5 requires this behavior, and starting in Gecko 10.0 (Firefox 10.0 / Thunderbird 10.0 / SeaMonkey 2.7), this also works in standards mode (bug 80784, bug 93077).
Block and Inline layout
- [This quirk is present in almost standards mode.] Line height (not
line-height
) calculations are different to fix bug 5821 and bug 24186 (some other issues are described in bug 22274). See almost standards mode for more details. - There are a bunch of quirks to get percentage heights on images, tables, objects, and applets (etc.?) to "work" (the way they did in Netscape Navigator 4), even though CSS says that percentage heights should behave like 'auto' heights when the parent element doesn't have a fixed height. See bug 33443#c9. See also bug 41656 and its duplicates. Some of these quirks may cause other effects (see bug 54119).
- In quirks mode, the
FONT
element changes the color of text decorations specified on ancestor elements.
Proposed to apply in all modes: bug 747517. - In quirks mode,
text-decoration
is propagated into floating and absolutely positioned elements. - (Firefox 4 / Thunderbird 3.3 / SeaMonkey 2.1) In quirks mode,
text-decoration
is not propagated into tables (bug 572713). - maybe (Firefox 3) When computing the minimum intrinsic width of an inline flow directly in a table cell (no blocks in between), it is assumed that it is not possible to break before and after an image (when otherwise it would be).
- 已废弃 Gecko 8.0 Prior to Gecko 8.0 (Firefox 8.0 / Thunderbird 8.0 / SeaMonkey 2.5)
text-decoration
in quirks mode had line thickness and position adjusted on descendant text to match the descendant.
Tables
TD
,TH
,TR
,THEAD
,TBODY
, andTFOOT
elements have the document background (and color?) applied to them (when the document background is specified in certain ways?) (see also bug 70831). [This may have been an accurate description when written in June 2001, but no longer appears accurate. Should look into TableQuirkColorRule, re-describe, and figure out when it changed.]- The
empty-cells
property defaults tohide
in quirks mode butshow
(according to CSS2.1) in standards mode (see bug 33244) (though the correct fix would be to specify it on the HTMLTABLE
element inquirk.css
). - In quirks mode floated tables never move to the next "line" if they don't fit next to other floats, they just keep widening the page (see bug 43086). To correspond, their width is computed as though only the remaining available space is the containing block width (bug 99461).
- In quirks mode
colspan="0"
androwspan="0"
are intentionally not handled as described in HTML4 (bug 9879). hspace
andvspace
are supported onTABLE
only in quirks mode (bug 41893).
Proposed to remove: bug 725646.- In quirks mode, when tables have a border style of
inset
oroutset
, the border color is based on the background color of the table or of the nearest ancestor with non-transparent background. [This may have been an accurate description when written in June 2001, but it no longer appears correct. I don't follow the code in nsCSSRenderingBorders well enough to tell, though.] - In quirks mode a fixed width specified on a table cell resets the
nowrap
attribute. If thenowrap
attribute is present the cell width will never be smaller than the specified fixed width (bug 277232). - In quirks mode, tables with no rows/rowgroups have zero height even when a height is specified (bug 241161).
- Something about the overhanging border (i.e., the half of the border that's outside the border-box) in border-collapse tables differs between quirks mode and standards mode. [See nsTableFrame::GetDeflationForBackground and figure out what really differs, and when it started differing.]
- Gecko had bug 248239, where table cells acted as they had
box-sizing:border-box
applied for the purpose of theheight
property. This is fixed in Gecko 16 (Firefox 16) for standards mode but remains in quirks mode for compatibility with quirks mode behavior of other browsers. - (Firefox 16 / Thunderbird 16 / SeaMonkey 2.13) Since this version bug 338554 is fixed and
(-moz-)box-sizing
applies to table cells in standards mode, but quirks mode keeps the old behavior. - 已废弃 Gecko 1.9 (Firefox 3) In quirks mode table cells with a border have a minimum width of one pixel.
- 已废弃 Gecko 1.9 (Firefox 3) The basic table layout strategy ignores padding (on what) in quirks mode.
- 已废弃 Gecko 1.9 (Firefox 3) The basic table layout strategy handles widths differently in some way.
- 已废弃 Gecko 2.0 (Firefox 4 / Thunderbird 3.3 / SeaMonkey 2.1) In quirks mode
absmiddle
(handled incorrectly?) andmiddle
(perhaps incorrectly as well?) are accepted as values ofalign
on table cells, andabsmiddle
,abscenter
, andmiddle
are supported on tables (treated the same ascenter
).
Removed in bug 559834 and bug 573322, thoughmiddle
andabsmiddle
in table cells work in all modes now. - In quirks mode, percentage values are supported on the
cellspacing
attribute, but treated as pixels (bug 106336).
已废弃 Gecko 13.0 (Firefox 13.0 / Thunderbird 13.0 / SeaMonkey 2.10) This quirk has been adopted in standards mode now.
Frames
- In quirks mode
marginwidth
andmarginheight
on aFRAME
are propagated to the containedBODY
. - In a
FRAMESET
cols
/rows
specification0*
is treated as1*
(see bug 40383). - 已废弃 The
scrolling
attribute onFRAME
is handled differently.
HTML Parser
- In quirks mode, we parsed HTML comments in a non-SGML way compatible with other browsers instead of treating "--" as the comment start and end delimiter.
已废弃 Gecko 2.0 (Firefox 4 / Thunderbird 3.3 / SeaMonkey 2.1) This quirk is now HTML5 conform and has been adopted in standards mode.
Original Document Information
- Author(s): David Baron, Boris Zbarsky