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I particularly wanted these Cosmos Components to be usable in vanilla HTML, without any bundler or frontend framework whatsoever. I find this is great for prototyping and simple projects. 
<!DOCTYPE html>
<html>
  <head>
    <title>Example Dapp</title>
    <script type="importmap">
      {
        "imports": {
          "@kiruse/cosmos-components": "https://esm.sh/@kiruse/cosmos-components",
          "@apophis-sdk/core": "https://esm.sh/@apophis-sdk/core",
          "@apophis-sdk/cosmos": "https://esm.sh/@apophis-sdk/cosmos",
          "@apophis-sdk/cosmwasm": "https://esm.sh/@apophis-sdk/cosmwasm",
        }
      }
    </script>
    <script type="module" src="setup.js"></script>
  </head>
  <body>
    <cosmos-connect-boundary>
      <div slot="connect">
        <button id="connect-wallet">Connect Wallet</button>
      </div>
      <div slot="content">
        Hello, <cosmos-user-address />!
      </div>
    </cosmos-connect-boundary>
    <script type="module" src="index.js"></script>
  </body>
</html>
Note that not all browsers support separate import maps, so for the time being you will need to always inline it in your HTML.
setup.js
import { CosmosElements } from '@kiruse/cosmos-components';
import { reconnectSigners } from '@kiruse/cosmos-components/utils.js';
import { Apophis, Cosmos } from '@apophis-sdk/cosmos';
import { CosmWasm, DefaultCosmWasmMiddlewares } from '@apophis-sdk/cosmwasm';

Apophis.use(...DefaultCosmWasmMiddlewares);
CosmosElements.register();

// in a `type="module"` script you can `await` on top level scope
export const networks = Promise.all([
  Cosmos.getNetworkFromRegistry('neutron'),
  Cosmos.getNetworkFromRegistry('neutrontestnet'),
]);

networks.then(networks => reconnectSigners(networks));
index.js
import { modals } from '@kiruse/cosmos-components';
import { networks } from './setup.js';

document.getElementById('connect-wallet').addEventListener('click', async () => {
  modals.showWalletModal(await networks);
});
My personal favorite for writing HTML is Pug, although it requires some additional build steps to get the final HTML. The above snippet can be written in Pug as: 
doctype html
html
  head
    title Example Dapp
    script(type="importmap")
      | {
      |   "imports": {
      |     "@kiruse/cosmos-components": "https://esm.sh/@kiruse/cosmos-components",
      |     "@apophis-sdk/core": "https://esm.sh/@apophis-sdk/core",
      |     "@apophis-sdk/cosmos": "https://esm.sh/@apophis-sdk/cosmos",
      |     "@apophis-sdk/cosmwasm": "https://esm.sh/@apophis-sdk/cosmwasm",
      |   }
      | }
    script(type="module" src="index.js")
  body
    cosmos-connect-boundary
      div(slot="connect")
        button#connect-wallet Connect Wallet
      div(slot="content")
        | Hello,
        cosmos-user-address
    script(type="module" src="index.js")
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