The issue with material-ui 0.15.2 is that it applies extra vendor-prefixed styles on the server side but not on the client side, resulting in warnings in React 15

I have set up my project with the following configurations:

  • react is at version 15.2.1
  • material-ui is at version 0.15.2
  • I am using express and universal-router for server-side rendering

Every time I include a material-ui component, I encounter this error message:

Warning: React attempted to reuse markup in a container but the checksum was invalid. This generally means that you are using server rendering and the markup generated on the server was not what the client was expecting. React injected new markup to compensate which works but you have lost many of the benefits of server rendering. Instead, figure out why the markup being generated is different on the client or server:

 (client) uot;);mui-prepared:;" data-reactid="36">
 (server) uot;);mui-prepared:;-webkit-transition:a

The root cause of this issue lies in the mismatch between the HTML rendered by express and that rendered by the browser (irrespective of browser type; I tested it on Chrome, Firefox, and Safari).

Here is the HTML generated by the server for the Paper component.

<div class="Cv_me_2f3" style="color:rgba(0, 0, 0, 0.87);background-color:#ffffff;transition:all 450ms cubic-bezier(0.23, 1, 0.32, 1) 0m... ...

This is how the same component looks like in the client's HTML.

<div class="Cv_me_2f3" style="color:rgba(0, 0, 0, 0.87);background-color:#ffffff;transition:all 450ms cubic-bezier(0.23, 1, 0.32, 1) 0m... ...

The discrepancy lies in...

In the style attribute towards the end...

style="...mui-prepared:;-webkit-transition:all 450ms cubic-bezier(0.23, 1, 0.32, 1) 0ms;-moz-box-sizing:border-box;" data-reactid="36"

To clarify, the -webkit-transition and -moz-box-sizing attributes were only added on the server side somehow.

I delved deeper and discovered that material-ui's theming system utilizes some prefixer to automatically prefix any inline styles, possibly via inline-style-prefixer. However, I'm unsure how to make use of this information.

I came across the static version of inline-style-prefixer that ensures uniformity in user agent between the client and server. Is there a way to implement this?

cssreactjsmaterial-uiisomorphic-javascriptvendor-prefix

Answer №1

By including the user-agent value from the HTTP request headers, you can resolve this issue.

global.navigator.userAgent = req.headers['user-agent'] || 'all';

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