--- a/dom/base/nsGkAtomList.h
+++ b/dom/base/nsGkAtomList.h
@@ -1359,17 +1359,16 @@ GK_ATOM(colorInterpolation, "color-inter
 GK_ATOM(colorInterpolationFilters, "color-interpolation-filters")
 GK_ATOM(colorProfile, "color-profile")
 GK_ATOM(cursor, "cursor")
 GK_ATOM(cx, "cx")
 GK_ATOM(cy, "cy")
 GK_ATOM(d, "d")
 GK_ATOM(darken, "darken")
 GK_ATOM(defs, "defs")
-GK_ATOM(definition_src, "definition-src")
 GK_ATOM(deg, "deg")
 GK_ATOM(desc, "desc")
 GK_ATOM(diffuseConstant, "diffuseConstant")
 GK_ATOM(dilate, "dilate")
 GK_ATOM(direction, "direction")
 GK_ATOM(disable, "disable")
 GK_ATOM(discrete, "discrete")
 GK_ATOM(divisor, "divisor")
@@ -1433,37 +1432,32 @@ GK_ATOM(foreignObject, "foreignObject")
 GK_ATOM(fractalNoise, "fractalNoise")
 GK_ATOM(fx, "fx")
 GK_ATOM(fy, "fy")
 GK_ATOM(G, "G")
 GK_ATOM(g, "g")
 GK_ATOM(gamma, "gamma")
 // 'generic' conflicts with msvc11 winrt compiler extensions
 GK_ATOM(generic_, "generic")
-GK_ATOM(glyph, "glyph")
 GK_ATOM(glyphRef, "glyphRef")
-GK_ATOM(glyph_orientation_horizontal, "glyph-orientation-horizontal")
-GK_ATOM(glyph_orientation_vertical, "glyph-orientation-vertical")
 GK_ATOM(grad, "grad")
 GK_ATOM(gradientTransform, "gradientTransform")
 GK_ATOM(gradientUnits, "gradientUnits")
 GK_ATOM(hardLight, "hard-light")
-GK_ATOM(hkern, "hkern")
 GK_ATOM(hue, "hue")
 GK_ATOM(hueRotate, "hueRotate")
 GK_ATOM(identity, "identity")
 GK_ATOM(image_rendering, "image-rendering")
 GK_ATOM(in, "in")
 GK_ATOM(in2, "in2")
 GK_ATOM(intercept, "intercept")
 GK_ATOM(k1, "k1")
 GK_ATOM(k2, "k2")
 GK_ATOM(k3, "k3")
 GK_ATOM(k4, "k4")
-GK_ATOM(kerning, "kerning")
 GK_ATOM(kernelMatrix, "kernelMatrix")
 GK_ATOM(kernelUnitLength, "kernelUnitLength")
 GK_ATOM(lengthAdjust, "lengthAdjust")
 GK_ATOM(letter_spacing, "letter-spacing")
 GK_ATOM(lighten, "lighten")
 GK_ATOM(lighting_color, "lighting-color")
 GK_ATOM(limitingConeAngle, "limitingConeAngle")
 GK_ATOM(linear, "linear")
@@ -1582,19 +1576,19 @@ GK_ATOM(textPath, "textPath")
 GK_ATOM(tref, "tref")
 GK_ATOM(tspan, "tspan")
 GK_ATOM(turbulence, "turbulence")
 GK_ATOM(unicode_bidi, "unicode-bidi")
 GK_ATOM(userSpaceOnUse, "userSpaceOnUse")
 GK_ATOM(view, "view")
 GK_ATOM(viewBox, "viewBox")
 GK_ATOM(viewTarget, "viewTarget")
-GK_ATOM(vkern, "vkern")
 GK_ATOM(white_space, "white-space")
 GK_ATOM(word_spacing, "word-spacing")
+GK_ATOM(writing_mode, "writing-mode")
 GK_ATOM(x, "x")
 GK_ATOM(x1, "x1")
 GK_ATOM(x2, "x2")
 GK_ATOM(xChannelSelector, "xChannelSelector")
 GK_ATOM(xor_, "xor")
 GK_ATOM(y, "y")
 GK_ATOM(y1, "y1")
 GK_ATOM(y2, "y2")

--- a/dom/base/nsTreeSanitizer.cpp
+++ b/dom/base/nsTreeSanitizer.cpp
@@ -325,19 +325,19 @@ nsIAtom** const kElementsSVG[] = {
   &nsGkAtoms::font, // font
   &nsGkAtoms::font_face, // font-face
   &nsGkAtoms::font_face_format, // font-face-format
   &nsGkAtoms::font_face_name, // font-face-name
   &nsGkAtoms::font_face_src, // font-face-src
   &nsGkAtoms::font_face_uri, // font-face-uri
   &nsGkAtoms::foreignObject, // foreignObject
   &nsGkAtoms::g, // g
-  &nsGkAtoms::glyph, // glyph
+  // glyph
   &nsGkAtoms::glyphRef, // glyphRef
-  &nsGkAtoms::hkern, // hkern
+  // hkern
   &nsGkAtoms::image, // image
   &nsGkAtoms::line, // line
   &nsGkAtoms::linearGradient, // linearGradient
   &nsGkAtoms::marker, // marker
   &nsGkAtoms::mask, // mask
   &nsGkAtoms::metadata, // metadata
   &nsGkAtoms::missingGlyph, // missingGlyph
   &nsGkAtoms::mpath, // mpath
@@ -353,17 +353,17 @@ nsIAtom** const kElementsSVG[] = {
   &nsGkAtoms::symbol, // symbol
   &nsGkAtoms::text, // text
   &nsGkAtoms::textPath, // textPath
   &nsGkAtoms::title, // title
   &nsGkAtoms::tref, // tref
   &nsGkAtoms::tspan, // tspan
   &nsGkAtoms::use, // use
   &nsGkAtoms::view, // view
-  &nsGkAtoms::vkern, // vkern
+  // vkern
   nullptr
 };
 
 nsIAtom** const kAttributesSVG[] = {
   // accent-height
   &nsGkAtoms::accumulate, // accumulate
   &nsGkAtoms::additive, // additive
   &nsGkAtoms::alignment_baseline, // alignment-baseline
@@ -426,18 +426,18 @@ nsIAtom** const kAttributesSVG[] = {
   &nsGkAtoms::format, // format
   &nsGkAtoms::from, // from
   &nsGkAtoms::fx, // fx
   &nsGkAtoms::fy, // fy
   // g1
   // g2
   // glyph-name
   // glyphRef
-  &nsGkAtoms::glyph_orientation_horizontal, // glyph-orientation-horizontal
-  &nsGkAtoms::glyph_orientation_vertical, // glyph-orientation-vertical
+  // glyph-orientation-horizontal
+  // glyph-orientation-vertical
   &nsGkAtoms::gradientTransform, // gradientTransform
   &nsGkAtoms::gradientUnits, // gradientUnits
   &nsGkAtoms::height, // height
   // horiz-adv-x
   // horiz-origin-x
   // horiz-origin-y
   &nsGkAtoms::id, // id
   // ideographic
@@ -445,17 +445,17 @@ nsIAtom** const kAttributesSVG[] = {
   &nsGkAtoms::in, // in
   &nsGkAtoms::in2, // in2
   &nsGkAtoms::intercept, // intercept
   // k
   &nsGkAtoms::k1, // k1
   &nsGkAtoms::k2, // k2
   &nsGkAtoms::k3, // k3
   &nsGkAtoms::k4, // k4
-  &nsGkAtoms::kerning, // kerning
+  // kerning
   &nsGkAtoms::kernelMatrix, // kernelMatrix
   &nsGkAtoms::kernelUnitLength, // kernelUnitLength
   &nsGkAtoms::keyPoints, // keyPoints
   &nsGkAtoms::keySplines, // keySplines
   &nsGkAtoms::keyTimes, // keyTimes
   &nsGkAtoms::lang, // lang
   // lengthAdjust
   &nsGkAtoms::letter_spacing, // letter-spacing
@@ -575,17 +575,17 @@ nsIAtom** const kAttributesSVG[] = {
   // vert-origin-x
   // vert-origin-y
   &nsGkAtoms::viewBox, // viewBox
   &nsGkAtoms::viewTarget, // viewTarget
   &nsGkAtoms::visibility, // visibility
   &nsGkAtoms::width, // width
   // widths
   &nsGkAtoms::word_spacing, // word-spacing
-  // writing-mode
+  &nsGkAtoms::writing_mode, // writing-mode
   &nsGkAtoms::x, // x
   // x-height
   &nsGkAtoms::x1, // x1
   &nsGkAtoms::x2, // x2
   &nsGkAtoms::xChannelSelector, // xChannelSelector
   &nsGkAtoms::y, // y
   &nsGkAtoms::y1, // y1
   &nsGkAtoms::y2, // y2

--- a/dom/svg/nsSVGElement.cpp
+++ b/dom/svg/nsSVGElement.cpp
@@ -990,24 +990,22 @@ nsSVGElement::sGraphicsMap[] = {
 // PresentationAttributes-TextContentElements
 /* static */ const Element::MappedAttributeEntry
 nsSVGElement::sTextContentElementsMap[] = {
   // Properties that we don't support are commented out.
   // { &nsGkAtoms::alignment_baseline },
   // { &nsGkAtoms::baseline_shift },
   { &nsGkAtoms::direction },
   { &nsGkAtoms::dominant_baseline },
-  // { &nsGkAtoms::glyph_orientation_horizontal },
-  // { &nsGkAtoms::glyph_orientation_vertical },
-  // { &nsGkAtoms::kerning },
   { &nsGkAtoms::letter_spacing },
   { &nsGkAtoms::text_anchor },
   { &nsGkAtoms::text_decoration },
   { &nsGkAtoms::unicode_bidi },
   { &nsGkAtoms::word_spacing },
+  { &nsGkAtoms::writing_mode },
   { nullptr }
 };
 
 // PresentationAttributes-FontSpecification
 /* static */ const Element::MappedAttributeEntry
 nsSVGElement::sFontSpecificationMap[] = {
   { &nsGkAtoms::font_family },
   { &nsGkAtoms::font_size },

--- a/layout/reftests/svg/text/reftest.list
+++ b/layout/reftests/svg/text/reftest.list
@@ -125,16 +125,19 @@ fuzzy-if(skiaContent,1,200) == textLengt
 fuzzy-if(/^Windows\x20NT\x2010\.0/.test(http.oscpu)||/^Windows\x20NT\x206\.[12]/.test(http.oscpu),4,17) fuzzy-if(skiaContent,1,100) == textLength-3.svg textLength-3-ref.svg
 == textLength-4.svg textLength-4-ref.svg
 == textLength-5.svg textLength-5-ref.svg
 == textLength-6.svg textLength-6-ref.svg
 
 # text-shadow
 == text-shadow.svg text-shadow-ref.svg
 
+# vertical text
+pref(layout.css.vertical-text.enabled,true) == vertical-01.svg vertical-01-ref.svg
+
 # tests for ignoring various properties
 == ignore-border.svg ignore-prop-ref.svg
 == ignore-display.svg ignore-display-ref.svg
 == ignore-float.svg ignore-prop-ref.svg
 == ignore-float-first-letter.svg ignore-prop-ref.svg
 == ignore-position.svg ignore-position-ref.svg
 == ignore-margin.svg ignore-prop-ref.svg
 == ignore-padding.svg ignore-prop-ref.svg

new file mode 100644
--- /dev/null
+++ b/layout/reftests/svg/text/vertical-01-ref.svg
@@ -0,0 +1,12 @@
+<!--
+     Any copyright is dedicated to the Public Domain.
+     http://creativecommons.org/publicdomain/zero/1.0/
+-->
+<svg xmlns="http://www.w3.org/2000/svg" xmlns:xlink="http://www.w3.org/1999/xlink">
+  <defs>
+    <path id="path" d="M 100, 100 v 200" />
+  </defs>
+  <text style="font: 48px sans-serif" text-rendering="geometricPrecision">
+    <textPath xlink:href="#path">A B C</textPath>
+  </text>
+</svg>

new file mode 100644
--- /dev/null
+++ b/layout/reftests/svg/text/vertical-01.svg
@@ -0,0 +1,10 @@
+<!--
+     Any copyright is dedicated to the Public Domain.
+     http://creativecommons.org/publicdomain/zero/1.0/
+-->
+<svg xmlns="http://www.w3.org/2000/svg">
+  <text x="100" y="100" text-rendering="geometricPrecision"
+        writing-mode="vertical-rl" style="text-orientation: sideways-right;font: 48px sans-serif">
+    A B C
+  </text>
+</svg>