Do not allow typing into readonly fields.

packages/driver/src/cy/commands/actions/type.coffee

@@ -88,9 +88,9 @@ module.exports = (Commands, Cypress, cy, state, config) ->
       isMonth     = $dom.isType(options.$el, "month")
       isWeek      = $dom.isType(options.$el, "week")
       hasTabIndex = $dom.isSelector(options.$el, "[tabindex]")
+      isReadonly  = options.$el.is('[readonly]')
 
       ## TODO: tabindex can't be -1
-      ## TODO: can't be readonly
 
       isTypeableButNotAnInput = isBody or (hasTabIndex and not isTextLike)
 
@@ -107,6 +107,13 @@ module.exports = (Commands, Cypress, cy, state, config) ->
           args: { num }
         })
 
+      if (isReadonly)
+        node = $dom.stringify(options.$el)
+        $utils.throwErrByPath("type.readonly", {
+          onFail: options._log
+          args: { node }
+        })
+
       if not (_.isString(chars) or _.isFinite(chars))
         $utils.throwErrByPath("type.wrong_type", {
           onFail: options._log

packages/driver/src/cypress/error_messages.coffee

@@ -894,6 +894,7 @@ module.exports = {
 
   type:
     empty_string: "#{cmd('type')} cannot accept an empty String. You need to actually type something."
+    readonly: "#{cmd('type')} cannot type into an element with a 'readonly' attribute. The element typed into was: {{node}}"
     invalid: "Special character sequence: '{{chars}}' is not recognized. Available sequences are: {{allChars}}"
     invalid_date: "Typing into a date input with #{cmd('type')} requires a valid date with the format 'yyyy-MM-dd'. You passed: {{chars}}"
     invalid_month: "Typing into a month input with #{cmd('type')} requires a valid month with the format 'yyyy-MM'. You passed: {{chars}}"

packages/driver/test/cypress/fixtures/dom.html

@@ -288,6 +288,16 @@
           <button>submit me</button>
           <input type="submit" value ="submit me2" />
         </form>
+
+        <form>
+          <!-- All values are valid readonly -->
+          <input id="readonly-attr" readonly />
+          <input id="readonly-readonly" readonly="readonly" />
+          <input id="readonly-empty-str" readonly="" />
+
+          <!-- Although not strictly part of spec, Chrome respects any string -->
+          <input id="readonly-str" readonly="abc" />
+        </form>
       </div>
 
       <div id="input-types">

packages/driver/test/cypress/integration/commands/actions/type_spec.js

@@ -115,9 +115,8 @@ describe('src/cy/commands/actions/type', () => {
         blurred = true
       })
 
-      cy
-      .get('input:text:first').type('foo')
-      .get('input:text:last').type('bar')
+      cy.get('input:text:first').type('foo')
+      cy.get('input:text:last').type('bar')
       .then(() => {
         expect(blurred).to.be.true
       })
@@ -456,9 +455,8 @@ describe('src/cy/commands/actions/type', () => {
           blur = true
         })
 
-        cy
-        .get('#tabindex').type('f')
-        .get('input:first').focus().then(() => {
+        cy.get('#tabindex').type('f')
+        cy.get('input:first').focus().then(() => {
           expect(blur).to.be.true
         })
       })
@@ -480,8 +478,7 @@ describe('src/cy/commands/actions/type', () => {
           return keyups.push(e)
         })
 
-        cy
-        .get('#tabindex').type('f{leftarrow}{rightarrow}{enter}')
+        cy.get('#tabindex').type('f{leftarrow}{rightarrow}{enter}')
         .then(() => {
           expect(keydowns).to.have.length(4)
           expect(keypresses).to.have.length(2)
@@ -495,8 +492,7 @@ describe('src/cy/commands/actions/type', () => {
       it('adds delay to delta for each key sequence', () => {
         cy.spy(cy, 'timeout')
 
-        cy
-        .get(':text:first')
+        cy.get(':text:first')
         .type('foo{enter}bar{leftarrow}', { delay: 5 })
         .then(() => {
           expect(cy.timeout).to.be.calledWith(5 * 8, true, 'type')
@@ -4192,6 +4188,25 @@ describe('src/cy/commands/actions/type', () => {
         cy.get('input:first').type('a').type('b')
       })
 
+      _.each([
+        { id: 'readonly-attr', val: '' },
+        { id: 'readonly-empty-str', val: '' },
+        { id: 'readonly-readonly', val: 'readonly' },
+        { id: 'readonly-str', val: 'abc' },
+      ], (attrs) => {
+        it(`throws when readonly ${attrs.val} attr (${attrs.id})`, (done) => {
+          cy.get(`#${attrs.id}`).type('foo')
+
+          cy.on('fail', (err) => {
+            expect(err.message).to.include('cy.type() cannot type into an element with a \'readonly\' attribute.')
+            expect(err.message).to.include('The element typed into was:')
+            expect(err.message).to.include(`<input id="${attrs.id}" readonly="${attrs.val}">`)
+
+            done()
+          })
+        })
+      })
+
       it('throws when not textarea or text-like', (done) => {
         cy.get('form').type('foo')
 

packages/runner/src/lib/dom.js

@@ -308,7 +308,7 @@ function getElementDimensions ($el) {
   return dimensions
 }
 
-function getAttr (el, attr) {
+function getNumAttrValue (el, attr) {
   // nuke anything thats not a number or a negative symbol
   const num = _.toNumber(el.css(attr).replace(/[^0-9\.-]+/, ''))
 
@@ -320,15 +320,15 @@ function getAttr (el, attr) {
 }
 
 function getPadding (el, dir) {
-  return getAttr(el, `padding-${dir}`)
+  return getNumAttrValue(el, `padding-${dir}`)
 }
 
 function getBorder (el, dir) {
-  return getAttr(el, `border-${dir}-width`)
+  return getNumAttrValue(el, `border-${dir}-width`)
 }
 
 function getMargin (el, dir) {
-  return getAttr(el, `margin-${dir}`)
+  return getNumAttrValue(el, `margin-${dir}`)
 }
 
 function getTotalFor (directions, dimensions) {