Firefox Browser Compatibility Browser Compatibility
These guidelines detect Firefox browser compatibility issues.
Rules
is
attribute has partial supportdata
element has partial supportdetails
element has partial supportname
attribute ondetails
elements has partial supportdialog
element has partial supportsrcdoc
attribute has partial supportinput type=color
has partial supportlist
oninput type=color
has partial supportinput type=date
has partial supportinput type=datetime-local
has partial supportinput type=number
has partial support- Insecure password field
input type=range
has partial supportlist
oninput type=range
has partial supportinput type=time
has partial support- HTML imports are no longer supported
- MathML has partial support
menu
element has partial supportmenuitem
element has partial supportmeta http-equiv=Set-Cookie
no longer supportedmeter
element has partial supportreversed
attribute has partial supportoutput
element has partial supportpopover
attribute has partial support- Script modules have partial support
- Script MIME type with partial support
- Scoped stylesheets unsupported
xml:base
is unsupportedsummary
element has partial supporttemplate
element has partial supporttrack
element has partial supportisindex
element is unsupported@counter-style
has partial support@layer
has partial supportall:
property has partial supportbackground-repeat
two value syntax has partial supportbackground-repeat
four value syntax has partial supportbackdrop-filter:
property has partial supportborder-block-
andborder-inline-
properties have partial supportborder-start-start-radius:
property has partial supportborder-start-end-radius:
property has partial supportborder-end-start-radius:
property has partial supportborder-end-end-radius:
property has partial supportgrid:
property has partial supportrevert
CSS keyword has partial support-moz-border-radius:
property is unsupported-moz-box-shadow:
property is unsupportedclip-path:
property has partial support- CSS
light-dark()
function has partial support - CSS
color-mix()
function has partial support - CSS
color()
function has partial support hsl()
colors with 4 values have partial supporthsla()
colors with 3 values have partial supporthwb()
colors have partial supportlab()
colors have partial supportlch()
colors have partial supportoklab()
colors have partial supportoklch()
colors have partial supportrgb()
colors with 4 values have partial supportrgba()
colors with 3 values have partial supportmargin-block-
andmargin-inline-
properties have partial supportmask:
property has partial supportcalc()
in media queries has partial support- Media query ranges have partial support
overflow-block:
andoverflow-inline:
properties have partial supportpadding-block-
andpadding-inline-
properties have partial supportpage-break-after:
withavoid
,left
orright
has partial supportpage-break-before:
withavoid
,left
orright
has partial supportposition: sticky
property has partial support:any-link
selector has partial support:dir()
selector has partial support:focus-within
selector has partial support:focus-visible
selector has partial support:has()
selector has partial support:in-range
selector has partial support:is()
selector has partial support:modal
selector has partial support:out-of-range
selector has partial support:popover-open
selector has partial support:read-only
selector has partial support:read-write
selector has partial support:state()
selector has partial support:user-invalid
selector has partial support:user-valid
selector has partial support:visited
selector has partial support:where()
selector has partial supportshape-outside:
property has partial supportcap
unit has partial supportcq*
units have partial supportic
unit has partial supportlh
unit has partial supportq
unit has partial supportrlh
units have partial supportsv*
,lv*
anddv*
units have partial supportx
unit has partial support- Mixed content warning
- AVIF images have partial support
- WebP images have partial support
- Non-standard image format
- Java applets are unsupported
document.all
is a legacy Microsoft extensiondocument.write
does not work in XHTML pagesinnerHTML
does not work in XHTML pagescounter-set:
property has partial supportorphans:
property has partial supportpage-break-inside:
property has partial supportwidows:
property has partial supportdisplay: inline-block
has partial supportoverflow: clip
has partial supportwhite-space: pre-wrap
has partial supportwhite-space: pre-line
has partial supportopacity:
percentage values have partial supportscale:
property has partial supportrotate:
property has partial supporttext-shadow:
property has partial supporttransform:
property has partial supporttranslate:
property has partial support- Image maps with
id
but noname
have partial support compact
attribute is unsupporteddisplay: compact
is unsupported-moz-opacity:
property is unsupportedElement.outerText
property has partial supportwindow.opener.closed
does not work correctly**
exponent operator has partial supportwindow.showModalDialog
method is unsupportedisSupported()
method is not implementedblink
element is unsupportedilayer
element is unsupportedkeygen
element has very limited supportlayer
element is unsupportedruby
element has partial supportxml
element is unsupporteddiv src
attribute is unsupportedimg dynsrc
attribute is unsupportedimg controls
attribute is unsupportedimg loop
attribute is unsupportedimg start
attribute is unsupportedbordercolor
,bordercolordark
andbordercolorlight
are unsupportedtopmargin
attribute has partial supportleftmargin
attribute has partial supportbottommargin
attribute has partial supportrightmargin
attribute has partial supportview-source:
URL scheme has partial support- Silverlight no longer supported