diff --git a/.travis.yml b/.travis.yml
index b2757d64..36288736 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -11,15 +11,6 @@ branches:
   - master
   - /^v\d+\.\d+(\.\d+)?(-\S*)?$/
 install: "npm i && npm update"
-before_install:
-- | # quickly pass if only documentation is being updated
-    if [ "$TRAVIS_PULL_REQUEST" != "false" ]; then
-      TRAVIS_COMMIT_RANGE="FETCH_HEAD...$TRAVIS_BRANCH"
-      git diff --name-only $TRAVIS_COMMIT_RANGE | grep -qvE '(\.md$)|(^(docs|examples))/' || {
-        echo "Only docs were updated, stopping build process."
-        exit
-      }
-    fi
 before_deploy:
   - npm run build
 env:
diff --git a/src/core/components/layouts/base.jsx b/src/core/components/layouts/base.jsx
index ba468a5e..d0d56b37 100644
--- a/src/core/components/layouts/base.jsx
+++ b/src/core/components/layouts/base.jsx
@@ -40,6 +40,7 @@ export default class BaseLayout extends React.Component {
     let servers = specSelectors.servers()
 
     let SvgAssets = getComponent("SvgAssets")
+    let VersionPragmaFilter = getComponent("VersionPragmaFilter")
     let Info = getComponent("info")
     let Operations = getComponent("operations", true)
     let Models = getComponent("Models", true)
@@ -49,6 +50,9 @@ export default class BaseLayout extends React.Component {
     let Servers = getComponent("Servers")
     let Errors = getComponent("errors", true)
 
+    let isSwagger2 = specSelectors.isSwagger2()
+    let isOAS3 = specSelectors.isOAS3()
+
     let isLoading = specSelectors.loadingStatus() === "loading"
     let isFailed = specSelectors.loadingStatus() === "failed"
     let filter = layoutSelectors.currentFilter()
@@ -80,7 +84,7 @@ export default class BaseLayout extends React.Component {
 
       <div className='swagger-ui'>
           <SvgAssets />
-          <div>
+          <VersionPragmaFilter isSwagger2={isSwagger2} isOAS3={isOAS3} alsoShow={<Errors/>}>
             <Errors/>
             <Row className="information-container">
               <Col mobile={12}>
@@ -142,7 +146,7 @@ export default class BaseLayout extends React.Component {
                 <Models/>
               </Col>
             </Row>
-          </div>
+          </VersionPragmaFilter>
         </div>
       )
   }
diff --git a/src/core/components/version-pragma-filter.jsx b/src/core/components/version-pragma-filter.jsx
new file mode 100644
index 00000000..1130dbf2
--- /dev/null
+++ b/src/core/components/version-pragma-filter.jsx
@@ -0,0 +1,54 @@
+import React from "react"
+import PropTypes from "prop-types"
+
+export default class VersionPragmaFilter extends React.PureComponent {
+  static propTypes = {
+    isSwagger2: PropTypes.bool.isRequired,
+    isOAS3: PropTypes.bool.isRequired,
+    bypass: PropTypes.bool,
+    alsoShow: PropTypes.element,
+    children: PropTypes.any,
+  }
+
+  static defaultProps = {
+    alsoShow: null,
+    children: null,
+    bypass: false,
+  }
+
+  render() {
+    const { bypass, isSwagger2, isOAS3, alsoShow } = this.props
+
+    if(bypass) {
+      return <div>{ this.props.children }</div>
+    }
+
+    if(isSwagger2 && isOAS3) {
+      return <div className="version-pragma">
+        {alsoShow}
+        <div className="version-pragma__message version-pragma__message--ambiguous">
+          <div>
+            <h3>Unable to render this definition</h3>
+            <p><code>swagger</code> and <code>openapi</code> fields cannot be present in the same Swagger or OpenAPI definition. Please remove one of the fields.</p>
+            <p>Supported version fields are <code>swagger: {"\"2.0\""}</code> and those that match <code>openapi: 3.0.n</code> (for example, <code>openapi: 3.0.0</code>).</p>
+          </div>
+        </div>
+      </div>
+    }
+
+    if(!isSwagger2 && !isOAS3) {
+      return <div className="version-pragma">
+        {alsoShow}
+        <div className="version-pragma__message version-pragma__message--missing">
+          <div>
+            <h3>Unable to render this definition</h3>
+            <p>The provided definition does not specify a valid version field.</p>
+            <p>Please indicate a valid Swagger or OpenAPI version field. Supported version fields are <code>swagger: {"\"2.0\""}</code> and those that match <code>openapi: 3.0.n</code> (for example, <code>openapi: 3.0.0</code>).</p>
+          </div>
+        </div>
+      </div>
+    }
+
+    return <div>{ this.props.children }</div>
+  }
+}
diff --git a/src/core/plugins/oas3/helpers.js b/src/core/plugins/oas3/helpers.js
index 0300bb62..193c767e 100644
--- a/src/core/plugins/oas3/helpers.js
+++ b/src/core/plugins/oas3/helpers.js
@@ -6,7 +6,7 @@ export function isOAS3(jsSpec) {
     return false
   }
 
-  return oasVersion.startsWith("3")
+  return oasVersion.startsWith("3.0.")
 }
 
 export function isSwagger2(jsSpec) {
@@ -15,7 +15,7 @@ export function isSwagger2(jsSpec) {
     return false
   }
 
-  return swaggerVersion.startsWith("2")
+  return swaggerVersion.startsWith("2.0")
 }
 
 export function OAS3ComponentWrapFactory(Component) {
diff --git a/src/core/presets/base.js b/src/core/presets/base.js
index 10fba1e3..8a7812d7 100644
--- a/src/core/presets/base.js
+++ b/src/core/presets/base.js
@@ -66,6 +66,7 @@ import ArrayModel from "core/components/array-model"
 import PrimitiveModel from "core/components/primitive-model"
 import Property from "core/components/property"
 import TryItOutButton from "core/components/try-it-out-button"
+import VersionPragmaFilter from "core/components/version-pragma-filter"
 import VersionStamp from "core/components/version-stamp"
 import DeepLink from "core/components/deep-link"
 import SvgAssets from "core/components/svg-assets"
@@ -125,6 +126,7 @@ export default function() {
       TryItOutButton,
       Markdown,
       BaseLayout,
+      VersionPragmaFilter,
       VersionStamp,
       OperationExt,
       OperationExtRow,
diff --git a/src/style/_layout.scss b/src/style/_layout.scss
index 812f461e..5cffd574 100644
--- a/src/style/_layout.scss
+++ b/src/style/_layout.scss
@@ -796,3 +796,30 @@ a.nostyle {
     cursor: pointer;
   }
 }
+
+.version-pragma {
+  height: 100%;
+  padding: 5em 0px;
+
+  &__message {
+    display: flex;
+    justify-content: center;
+    height: 100%;
+    font-size: 1.2em;
+    text-align: center;
+    line-height: 1.5em;
+
+    padding: 0px .6em;
+
+    > div {
+      max-width: 55ch;
+      flex: 1;
+    }
+
+    code {
+      background-color: #dedede;
+      padding: 4px 4px 2px;
+      white-space: pre;
+    }
+  }
+}
diff --git a/test/components/version-pragma-filter.js b/test/components/version-pragma-filter.js
new file mode 100644
index 00000000..c7d653fe
--- /dev/null
+++ b/test/components/version-pragma-filter.js
@@ -0,0 +1,70 @@
+/* eslint-env mocha */
+import React from "react"
+import expect, { createSpy } from "expect"
+import { shallow } from "enzyme"
+import { fromJS, Map } from "immutable"
+import VersionPragmaFilter from "components/version-pragma-filter"
+
+describe("<VersionPragmaFilter/>", function(){
+  it("renders children for a Swagger 2 definition", function(){
+    // When
+    let wrapper = shallow(
+      <VersionPragmaFilter isSwagger2={true} isOAS3={false}>
+        hello!
+      </VersionPragmaFilter>
+    )
+
+    // Then
+    expect(wrapper.find("div").length).toEqual(1)
+    expect(wrapper.find("div").text()).toEqual("hello!")
+  })
+  it("renders children for an OpenAPI 3 definition", function(){
+    // When
+    let wrapper = shallow(
+      <VersionPragmaFilter isSwagger2={false} isOAS3={true}>
+        hello!
+      </VersionPragmaFilter>
+    )
+
+    // Then
+    expect(wrapper.find("div").length).toEqual(1)
+    expect(wrapper.find("div").text()).toEqual("hello!")
+  })
+  it("renders children when a bypass prop is set", function(){
+    // When
+    let wrapper = shallow(
+      <VersionPragmaFilter bypass>
+        hello!
+      </VersionPragmaFilter>
+    )
+
+    // Then
+    expect(wrapper.find("div").length).toEqual(1)
+    expect(wrapper.find("div").text()).toEqual("hello!")
+  })
+  it("renders the correct message for an ambiguous-version definition", function(){
+    // When
+    let wrapper = shallow(
+      <VersionPragmaFilter isSwagger2={true} isOAS3={true}>
+        hello!
+      </VersionPragmaFilter>
+    )
+
+    // Then
+    expect(wrapper.find("div.version-pragma__message--ambiguous").length).toEqual(1)
+    expect(wrapper.find("div.version-pragma__message--missing").length).toEqual(0)
+  })
+  it("renders the correct message for a missing-version definition", function(){
+    // When
+    let wrapper = shallow(
+      <VersionPragmaFilter isSwagger2={false} isOAS3={false}>
+        hello!
+      </VersionPragmaFilter>
+    )
+
+    // Then
+    expect(wrapper.find("div.version-pragma__message--missing").length).toEqual(1)
+    expect(wrapper.find("div.version-pragma__message--ambiguous").length).toEqual(0)
+  })
+
+})