Firefox Browser Compatibility Browser Compatibility

• Firefox Browser Compatibility

These guidelines detect Firefox browser compatibility issues.

Rules

• is attribute has partial support
• data element has partial support
• details element has partial support
• dialog element has partial support
• srcdoc attribute has partial support
• input type=color has partial support
• list on input type=color has partial support
• input type=date has partial support
• input type=datetime-local has partial support
• input type=number has partial support
• Insecure password field
• input type=range has partial support
• list on input type=range has partial support
• input type=time has partial support
• HTML imports are no longer supported
• MathML has partial support
• menu element has partial support
• menuitem element has partial support
• meta http-equiv=Set-Cookie no longer supported
• meter element has partial support
• reversed attribute has partial support
• output element has partial support
• Script modules have partial support
• Script MIME type with partial support
• Scoped stylesheets unsupported
• xml:base is unsupported
• summary element has partial support
• template element has partial support
• track element has partial support
• isindex element is unsupported
• @counter-style has partial support
• @layer has partial support
• all: property has partial support
• background-repeat two value syntax has partial support
• background-repeat four value syntax has partial support
• border-block- and border-inline- properties have partial support
• border-start-start-radius: property has partial support
• border-start-end-radius: property has partial support
• border-end-start-radius: property has partial support
• border-end-end-radius: property has partial support
• grid: property has partial support
• revert CSS keyword has partial support
• -moz-border-radius: property is unsupported
• -moz-box-shadow: property is unsupported
• clip-path: property has partial support
• CSS color-mix() function has partial support
• CSS color() function has partial support
• hsl() colors with 4 values have partial support
• hsla() colors with 3 values have partial support
• hwb() colors have partial support
• lab() colors have partial support
• lch() colors have partial support
• oklab() colors have partial support
• oklch() colors have partial support
• rgb() colors with 4 values have partial support
• rgba() colors with 3 values have partial support
• margin-block- and margin-inline- properties have partial support
• mask: property has partial support
• calc() in media queries has partial support
• Media query ranges have partial support
• overflow-block: and overflow-inline: properties have partial support
• padding-block- and padding-inline- properties have partial support
• page-break-after: with avoid, left or right has partial support
• page-break-before: with avoid, left or right has partial support
• position: 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
• :in-range selector has partial support
• :is() selector has partial support
• :modal selector has partial support
• :out-of-range selector has partial support
• :read-only selector has partial support
• :read-write 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 support
• shape-outside: property has partial support
• cap unit has partial support
• cq* units have partial support
• ic unit has partial support
• q unit has partial support
• sv*, lv* and dv* units have partial support
• x 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 extension
• document.write does not work in XHTML pages
• innerHTML does not work in XHTML pages
• counter-set: property has partial support
• orphans: property has partial support
• page-break-inside: property has partial support
• widows: property has partial support
• display: inline-block has partial support
• overflow: clip has partial support
• white-space: pre-wrap has partial support
• white-space: pre-line has partial support
• opacity: percentage values have partial support
• scale: property has partial support
• rotate: property has partial support
• text-shadow: property has partial support
• transform: property has partial support
• translate: property has partial support
• Image maps with id but no name have partial support
• compact attribute is unsupported
• display: compact is unsupported
• -moz-opacity: property is unsupported
• Element.outerText property has partial support
• window.opener.closed does not work correctly
• ** exponent operator has partial support
• window.showModalDialog method is unsupported
• isSupported() method is not implemented
• blink element is unsupported
• ilayer element is unsupported
• keygen element has very limited support
• layer element is unsupported
• ruby element has partial support
• xml element is unsupported
• div src attribute is unsupported
• img dynsrc attribute is unsupported
• img controls attribute is unsupported
• img loop attribute is unsupported
• img start attribute is unsupported
• bordercolor, bordercolordark and bordercolorlight are unsupported
• topmargin attribute has partial support
• leftmargin attribute has partial support
• bottommargin attribute has partial support
• rightmargin attribute has partial support
• view-source: URL scheme has partial support
• Silverlight no longer supported