Return styles to browser defaults.
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README.md

Default Stylesheet

Return styles to browser defaults.

Warning: Work in Progress!

This technique is still a work in progress. Styles for all elements are not yet completely isolated. Using the Firefox's browser default stylesheet means that it doesn't quite work as expected in other browsers.

To see the current progress for yourself visit the example page.

Alternatively, you can run it yourself by:

git clone https://github.com/thallada/default-stylesheet
cd default-stylesheet
npm install
npm run build
python -m SimpleHTTPServer 8888

Then visit http://localhost:8888/example/index.html in your browser.

That said, I've had success using only Bootstrap components on top of this reset in another project.

Why this is needed

If you have applied an all: initial reset, the affected elements will have absolutely no styling because they have been reset to the element's initial values as defined in the CSS spec (e.g. all elements will be inline). all: initial effectively undoes all styling on an element including the browser default styling.

Applying this stylesheet after applying an all: initial style will return elements to some sane browser default. It "redoes" the browser default stylesheet after undoing it.

Will this work in non-Firefox browsers?

Theoretically yes, you will just end up with a styling that looks a lot like Firefox. This stylesheet is based upon the default Firefox stylesheets, but with modifications to remove -moz- prefixes, %if blocks, and Firefox-specific properties.

You can use CSS resets, such as normalize.css, to normalize the Firefox styling to a cross-browser default standard.

Usage

You have two options:

Import source and process with Webpack (recommended)

Using Webpack with PostCSS will give you the most control over how this stylesheet is applied. Additionally, since all: initial is only supported by Firefox at the time of writing, the postcss-initial plugin is necessary to polyfill it for other browsers.

If you are using all: initial to isolate a specific element on the page from the surrounding CSS cascade, you will likely want to scope it and this stylesheet to that specific element. This can either be done by nesting Sass selectors or by using the postcss-prepend-selector plugin.

The advantage of using postcss-prepend-selector is that you won't have to wrap every style in a selector to your embedded element. It will automatically prepend every selector in your project with the selector at Webpack build-time.

Here is an example of a Sass file that fully resets an embedded element:

/* Note: Because postcss-prepend-selector is used in this project, all selectors defined in any CSS/SCSS file will have
 * "#embedded.embedded " prepended to them so that all styles here will be scoped to *only* the root div. */

/* reset all element properties to initial values as defined in CSS spec (*not* browser defaults) */
* {
  all: initial;
  /* allow all elements to inherit these properties from the root "body" div */
  font-family: inherit;
  font-size: inherit;
  font-weight: inherit;
  line-height: inherit;
  color: inherit;
  text-align: left;
  background-color: inherit;
  cursor: inherit;
}

/* apply Firefox's default stylesheet so that Bootstrap has some browser-like styling to work with */
@import '~default-stylesheet/default.css';

/* apply the Bootstrap reboot (normalize.css) to convert Firefox default styling to some cross-browser baseline
 * then, apply the Bootstrap component styling */
@import '~bootstrap/scss/bootstrap';

/* Since elements inside the embedded div can no longer inherit styles set on the <body>, we will apply the styles
 * that the Bootstrap reboot applies to the <body> on the wrapper div instead, which containing elements can inherit.
 *
 * <div id="embedded" class="embedded">
 *   <div class="embedded-wrapper">
 *     <!-- ... embedded component here ... -->
 *   </div>
 * </div>
 */
.embedded-wrapper {
  font-family: $font-family-base;
  font-size: $font-size-base;
  font-weight: $font-weight-base;
  line-height: $line-height-base;
  color: $body-color;
  text-align: left;
  background-color: rgb(255, 255, 255);
}

And an example Webpack 3 SCSS/CSS rule to process it:

{
  test: /(.scss|.css)$/,
  use: [
    'style-loader',
    {
      loader: 'css-loader',
      options: {
        sourceMap: true,
        importLoaders: 1,
      },
    },
    {
      loader: 'postcss-loader',
      options: {
        sourceMap: true,
        ident: 'postcss',
        plugins: () => [
          /* eslint-disable global-require */
          require('autoprefixer'),
          require('postcss-initial')(),
          require('postcss-prepend-selector')({ selector: '#embedded.embedded ' }),
          /* eslint-enable global-require */
        ],
      },
    },
    {
      loader: 'sass-loader',
      options: {
        sourceMap: true,
        includePaths: [
          path.join(__dirname, '../node_modules'),
          path.join(__dirname, '../src'),
        ],
      },
    },
  ],
},

Include pre-built CSS

This project includes built CSS files in-case you are not using Webpack or PostCSS. However, all of the styles are scoped to the hard-coded selector "#embedded.embedded". Make sure there is an element on the page that has the id "embedded" and a class name of "embedded". The styles will be applied to that div.

<html>
  <head>
    <!--- ... other stylesheets ... -->
    <link rel="stylesheet" type="text/css" href="default.min.css">
  </head>
  <body>
    <!-- ... other elements not affected ... -->
    <div id="embedded" class="embedded">
      <!--- ... embedded component here will be reset to default ... -->
    </div>
    <!-- ... other elements not affected ... -->
  </body>
</html