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I am trying to develop a Drupal 8 module in which I have to override the html.html.twig template. The idea is that I do not want any of the default html.html.twig template returned instead I only want the custom template returned. I have been spending hours Google hunting and trying to make sense of the many examples and I have gotten myself totally confused.

What is happening is the content of my custom template are being displayed in the default html template so I am seeing the custom content inside the default html template rather than overriding the default content.

For the sake of getting this template override working I have simplified the module as much as possible and simply want to return the contents of a variable into a placeholder in the twig template. Once this override is working I can go back and add the code that will create the correct content to be output into a number of variables in the template.

What I do not understand is exactly how to I override the html.html.twig template.

My module is called unsw_blocks and in the unsw_blocks.module I have the following

function unsw_blocks_theme() {

$theme = [
'unsw_blocks' => [
     'variables' => ['test_var' => NULL],
    ],
];

return $theme;
}

In the Unsw_blocksController.php have the following

class Unsw_blocksController extends ControllerBase {

  public function unsw_blocks($name) {
  return [
    '#theme' => 'unsw_blocks',
    '#test_var' => $this->t('The variable called test_var simply passes this text itself to the theme template'),
  ];
  }
}

In the custom modules templates directory I have unsw-blocks.html.twig which simply contains

<h1>Testing Template</h1>

<p>test_var: {{ test_var }}</p>
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HI please follow the below steps.

Step 1: create routing docroot\modules\custom\product\product.routing.yml

product.custom_form: path: '/product/details/{product}' defaults: _controller: '\Drupal\product\Controller\ProductDetailsController::details' _title: 'Product Details' requirements: _permission: 'access content' options: parameters: product: type: entity:node

Step 2: create controller ProductDetailsController.php

docroot\modules\custom\product\src\Controller\ProductDetailsController.php

/** * Callback for route product.custom_form. */ public function details($product)

return [
  '#theme' => 'product-details',
  '#content' => [
    '#contextual_links' => [
      'node' => [
        'route_parameters' => ['node' => $product->id()],
      ],
    ],
  ],
  '#product' => $product,

];

}

Step 3:

In theme create file product-details.html.twig

docroot\themes\custom\mytheme\templates\product-details.html.twig

Sample code of above twig file:

{{ product.title.value }} {{ title_suffix }} {% if product.field_title_description %} {{ product.field_title_description.value }} {% endif %}

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AFAIK you can't override html.twig in a module, but you can create module with a route and a controller that returns a Symfony response to bypass this limitation. There is background-information and a code example in this question:

Override html.twig.html within custom module

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