Contents cache demo

The error layout is inconsistent with the general layout structure.

Error layout:

<template>
  <section class="warpper">
    // ...
  </section>
</template>

Render results

<section class="container">
  <section class="warpper">
     // ...
  </section>
</section >

Default layout:

<template>
  <section class="warpper">
    // ...
  </section>
</template>

Render results

  <section class="warpper">
     // ...
  </section>

Error layout outer layer more than one container.

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