Any way to display some heavily-styled HTML in isolation from the rest of site's styles?

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I am trying to figure out a way to display an archive of email newsletters on my client\'s site. The issue is that the newsletters are full of a zillion inline styles, whic

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死守一世寂寞

2020-12-18 07:52

Is there a reason why you can't use a modal? That would allow you to force a new request and make the page render how you'd want it to by not applying your general stylesheet while at the same time keeping your user on the desired page. Of course, it doesn't display the element inline so-to-speak, but it's nearly functionally equivelent.

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南旧

2020-12-18 07:57

Another option that I haven't used myself but am looking to possibly leverage in a similar situation is to use the Shadow DOM which is part of the Web Components spec. My main concern is that we still have some user's using IE 11 and while there seems to be support for polyfills it doesn't look like covering all browser's is real straight forward based on what I've read elsewhere.

Some details on how to use Shadow DOM to this effect can be found here and here. I've also created a small gist that I've created to demonstrate basic idea that I've been formulating as I learn about how the Shadow DOM works which I'll be updating as I learn more. Below you can see a snapshot of the content of that gist.

<!doctype html>
<html>

<head>
    <style>
        .row {
            display: flex;
        }

        .column {
            flex: 50%;
            padding: 10px;
            height: 300px;
        }

        * {
            color: Red;
        }
    </style>
</head>

<body>
    <div class="row">
        <div class="column" style="background-color:#aaa;">
            <h2>Column 1</h2>
            <div id="content1">
                SOME CONTENT FROM CMS
            </div>
        </div>
        <div class="column" style="background-color:#bbb;">
            <h2>Column 2</h2>
            <div id="content2">
                SOME MORE CONTENT FROM CMS
            </div>
        </div>
    </div>

    <script>
        document
            .getElementById("content1")
            .attachShadow({ mode: 'open' })
            .innerHTML = `
                <style>
                    *{all:initial} 
                    style{display: none}
                    div{display: block}
                </style>
                <h3>This text is not red</h3>
                <div>slot content: <slot></slot></div>`;

        document
            .getElementById("content2")
            .attachShadow({ mode: 'open' })
            .innerHTML = `
                <style>
                    *{all:initial} 
                    style{display: none}
                    div{display: block}
                </style>
                <h3>This text is not red</h3>
                <div>slot content: <slot></slot></div>`;
    </script>
</body>

</html>

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情书的邮戳

2020-12-18 08:02
Cutting and pasting raw HTML presents too many security problems, in my opinion. Never trust user's input. Even when the content is entirely benign, next week the designer of newsletter might decide to change their formatting or incorporate some javascript and you'll be responsible for anything that might go wrong.

Therefore I would implement a parser that would drop anything but the content part and leave only b, a, h*, blockquote and similar simple elements, like the ones allowed in forum posts, as well as their styles. After that, you can display it as a normal post in a CMS. I don't see any reason why that should look differently.

As for how to isolate that from your other CSS, you don't really need to if you are careful that all of CSS rules of your CMS apply to elements with specific classes. Alternatively, do a CSS reset for your posts:
```
.post p {
     margin: 0;
     ... 
.post /* all the standard CSS reset rules preceded with .post */
```
and then
```
<div class="post"> content parsed from your CMS </div>
```
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予麋鹿

2020-12-18 08:02
9 years later and there still isn't a better solution.

If you don't have an external source (you can't add html into a frame manually) you need to use js to insert the messy html/css (in my case I use it to view emails)
```
<iframe class="my-frame" width="100%" height="100%" src="about:blank"></iframe>
```
and js:
```
const frame = document.querySelector('.my-frame');

frame.contentWindow.document.open('text/html', 'replace');
frame.contentWindow.document.write(hereGoesYourMessyHtmlCss);
frame.contentWindow.document.close();
```
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南方客

2020-12-18 08:05

IFrames are the only way to go that I've ever been able to find. The only alternative to this would be to override every style in the parent page's CSS for the newsletter display area.

As you noted, using an iframe will probably require you to host the newsletters in an independent file. The only alternative to this that I'm aware of is that you can use JavaScript to dynamically create and/or populate the iframe.

If you go with this method, you could have the newsletter present in a div with a specific class, and then use JavaScript to move the div into an iframe. The big downside being that this wouldn't happen for users without JavaScript enabled.

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