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scoped-svg-styles

scoped-svg-styles (@hint/hint-scoped-svg-styles)

Scoped SVG Styles checks if SVG styles affect any other elements outside the svg.

Why is this important?

As <style> inside inline <svg> elements are not scoped to <svg>, these can affect elements of dom outside the SVG. So it is important to detect if any style (CSS rule or selector) inside <svg> selects elements outside it.

What does the hint check?

This hint checks if styles inside SVG affect any other elements outside it. If any such style is found, it reports the CSS rule that is affecting and html elements that are being affected.

Examples that trigger the hint

Any style rule inside SVG that selects elements outside it will trigger the hint.

Example:

<html>
    <body>
        <h1 class="my-style">Heading</h1>

        <svg>
            <style>
                .my-style {
                    opacity: 0.5;
                }
            </style>
            <text class="my-style">SVG text</text>
        </svg>
    </body>
</html>

Examples that pass the hint

If in document, all styles inside SVGs are scoped to SVG only and are not affecting any element outside it, hint will pass.

Example:

<html>
    <body>
        <h1 class="html-style">Heading</h1>

        <svg>
            <style>
                .svg-style {
                    opacity: 0.5;
                }
            </style>
            <text class="svg-style">SVG text</text>
        </svg>
    </body>
</html>

Can the hint be configured?

This hint can be configured to limit the number of HTML elements reported per CSS rule. If the hint finds an affecting CSS rule, it generates one report related to that rule and an additional report for each HTML element matched by that rule.

If the maxReportsPerCSSRule option is passed to this hint, it will limit the number of reports related to affected elements, but reports related to the CSS rule will still be there.

How to pass maxReportsPerCSSRule option to hint

maxReportsPerCSSRule can be added in .hintrc as given below:

...
"hints": {
        "scoped-svg-styles": [
                "warning", {
                    "maxReportsPerCSSRule": 5
                }
        ]
    },
...

In above example, for every affecting rule, there can be a maximum of six reports. One report related to the CSS rule itself and a maximum of five reports related to affected elements.

How to use this hint?

To use it you will have to install it via npm:

npm install @hint/hint-scoped-svg-styles

Note: You can make npm install it as a devDependency using the --save-dev parameter, or to install it globally, you can use the -g parameter. For other options see npm‘s documentation.

And then activate it via the .hintrc configuration file:

{
    "connector": {...},
    "formatters": [...],
    "parsers": [...],
    "hints": {
        "scoped-svg-styles": "error"
    },
    ...
}