diff --git a/packages/hast-util-to-babel-ast/src/__snapshots__/index.test.ts.snap b/packages/hast-util-to-babel-ast/src/__snapshots__/index.test.ts.snap
index dc1bf524..1ea9512e 100644
--- a/packages/hast-util-to-babel-ast/src/__snapshots__/index.test.ts.snap
+++ b/packages/hast-util-to-babel-ast/src/__snapshots__/index.test.ts.snap
@@ -1,5 +1,5 @@
 // Jest Snapshot v1, https://goo.gl/fbAQLP
 
-exports[`hast-util-to-babel-ast should correctly transform svg 1`] = `"<svg width=\\"88px\\" height=\\"88px\\" viewBox=\\"0 0 88 88\\" version={1.1} xmlns=\\"http://www.w3.org/2000/svg\\" xmlnsXlink=\\"http://www.w3.org/1999/xlink\\"><title>{\\"Dismiss\\"}</title><desc>{\\"Created with Sketch.\\"}</desc><defs /><g id=\\"Blocks\\" stroke=\\"none\\" strokeWidth={1} fill=\\"none\\" fillRule=\\"evenodd\\" strokeLinecap=\\"square\\"><g id=\\"Dismiss\\" stroke=\\"#063855\\" strokeWidth={2}><path d=\\"M51,37 L37,51\\" id=\\"Shape\\" /><path d=\\"M51,51 L37,37\\" id=\\"Shape\\" /></g></g></svg>;"`;
-
 exports[`hast-util-to-babel-ast should handle spaces and tab 1`] = `"<svg viewBox=\\"0 0 32 32\\" xmlns=\\"http://www.w3.org/2000/svg\\"><path d=\\"M25,5h-3V3c0-1.7-1.3-3-3-3H5C3.3,0,2,1.3,2,3v20c0,1.7,1.3,3,3,3h4v1c0,2.2,1.8,4,4,4h12c2.2,0,4-1.8,4-4V9        C29,6.8,27.2,5,25,5z M5,24c-0.6,0-1-0.5-1-1V3c0-0.6,0.4-1,1-1h14c0.5,0,1,0.4,1,1v2h-6.3H13H6.3c-0.6,0-1,0.4-1,1s0.4,1,1,1h3.2       C9.4,7.3,9.2,7.7,9.1,8C9.1,8,9,8,9,8H6.5c-0.6,0-1,0.4-1,1s0.4,1,1,1H9v3c-0.1,0-0.1,0-0.2,0H6.1c-0.6,0-1,0.4-1,1s0.4,1,1,1h2.7       c0.1,0,0.1,0,0.2,0V16c-0.1,0-0.1,0-0.2,0H6.1c-0.6,0-1,0.4-1,1c0,0.6,0.4,1,1,1h2.7c0.1,0,0.1,0,0.2,0V19c-0.1,0-0.1,0-0.2,0H6.1       c-0.6,0-1,0.4-1,1s0.4,1,1,1h2.7c0.1,0,0.1,0,0.2,0v3H5z M27,27c0,1.1-0.9,2-2,2H13c-1.1,0-2-0.9-2-2V9c0-1.1,0.9-2,2-2h0.7H25       c1.1,0,2,0.9,2,2V27z M25.2,19c0,0.6-0.4,1-1,1H13.4c-0.6,0-1-0.4-1-1s0.4-1,1-1h10.7C24.7,18,25.2,18.4,25.2,19z M25.2,22       c0,0.6-0.4,1-1,1H13.4c-0.6,0-1-0.4-1-1s0.4-1,1-1h10.7C24.7,21,25.2,21.4,25.2,22z M25.2,25c0,0.6-0.4,1-1,1H13.4c-0.6,0-1-0.4-1-1       s0.4-1,1-1h10.7C24.7,24,25.2,24.4,25.2,25z M12.3,11c0-0.6,0.4-1,1-1h7.3c0.6,0,1,0.4,1,1s-0.4,1-1,1h-7.3       C12.8,12,12.3,11.6,12.3,11z M16,13c0.6,0,1,0.4,1,1s-0.4,1-1,1h-2.5c-0.6,0-1-0.4-1-1s0.4-1,1-1H16z\\" /></svg>;"`;
+
+exports[`hast-util-to-babel-ast transforms SVG 1`] = `"<svg width=\\"88px\\" height=\\"88px\\" viewBox=\\"0 0 88 88\\" version={1.1} xmlns=\\"http://www.w3.org/2000/svg\\" xmlnsXlink=\\"http://www.w3.org/1999/xlink\\"><title>{\\"Dismiss\\"}</title><desc>{\\"Created with Sketch.\\"}</desc><defs /><g id=\\"Blocks\\" stroke=\\"none\\" strokeWidth={1} fill=\\"none\\" fillRule=\\"evenodd\\" strokeLinecap=\\"square\\"><g id=\\"Dismiss\\" stroke=\\"#063855\\" strokeWidth={2}><path d=\\"M51,37 L37,51\\" id=\\"Shape\\" /><path d=\\"M51,51 L37,37\\" id=\\"Shape\\" /></g></g></svg>;"`;
diff --git a/packages/hast-util-to-babel-ast/src/index.test.ts b/packages/hast-util-to-babel-ast/src/index.test.ts
index 30e30547..2bb78c64 100644
--- a/packages/hast-util-to-babel-ast/src/index.test.ts
+++ b/packages/hast-util-to-babel-ast/src/index.test.ts
@@ -13,7 +13,7 @@ function transform(code: string) {
 }
 
 describe('hast-util-to-babel-ast', () => {
-  it('should correctly transform svg', () => {
+  it('transforms SVG', () => {
     const code = `
 <?xml version="1.0" encoding="UTF-8"?>
 <svg width="88px" height="88px" viewBox="0 0 88 88" version="1.1" xmlns="http://www.w3.org/2000/svg" xmlns:xlink="http://www.w3.org/1999/xlink">
@@ -32,27 +32,32 @@ describe('hast-util-to-babel-ast', () => {
     expect(transform(code)).toMatchSnapshot()
   })
 
-  it('should correctly transform aria-x', () => {
+  it('transforms "aria-x"', () => {
     const code = `<svg aria-hidden="true"></svg>`
     expect(transform(code)).toMatchInlineSnapshot(
       `"<svg aria-hidden=\\"true\\" />;"`,
     )
   })
 
-  it('should correctly transform aria-xxxXxx', () => {
+  it('transforms "aria-xxxXxx"', () => {
     const code = `<svg aria-labelledby="foo" aria-describedat="foo" aria-describedby="foo"></svg>`
     expect(transform(code)).toMatchInlineSnapshot(
       `"<svg aria-labelledby=\\"foo\\" aria-describedat=\\"foo\\" aria-describedby=\\"foo\\" />;"`,
     )
   })
 
-  it('should correctly transform data-x', () => {
+  it('transformss "data-x"', () => {
     const code = `<svg data-hidden="true"></svg>`
     expect(transform(code)).toMatchInlineSnapshot(
       `"<svg data-hidden=\\"true\\" />;"`,
     )
   })
 
+  it('preserves "mask-type"', () => {
+    const code = `<svg><mask mask-type="alpha" /></svg>`
+    expect(transform(code)).toBe('<svg><mask mask-type="alpha" /></svg>;')
+  })
+
   it('should handle spaces and tab', () => {
     const code = `<svg viewBox="0 0 32 32" xmlns="http://www.w3.org/2000/svg">
     <path d="M25,5h-3V3c0-1.7-1.3-3-3-3H5C3.3,0,2,1.3,2,3v20c0,1.7,1.3,3,3,3h4v1c0,2.2,1.8,4,4,4h12c2.2,0,4-1.8,4-4V9
diff --git a/packages/hast-util-to-babel-ast/src/mappings.ts b/packages/hast-util-to-babel-ast/src/mappings.ts
index fcccc409..d0e7ebbb 100644
--- a/packages/hast-util-to-babel-ast/src/mappings.ts
+++ b/packages/hast-util-to-babel-ast/src/mappings.ts
@@ -299,7 +299,6 @@ export const ATTRIBUTE_MAPPING = {
   mask: 'mask',
   maskcontentunits: 'maskContentUnits',
   maskunits: 'maskUnits',
-  'mask-type': 'maskType',
   mathematical: 'mathematical',
   mode: 'mode',
   numoctaves: 'numOctaves',