28 lines
1.8 KiB
Markdown
28 lines
1.8 KiB
Markdown
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# 8. Base Tag
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Date: 2020-11-22
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## Status
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Accepted
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## Context
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HTML documents may contain `base` tag within `head`, which influences URL resolution prefix for anchor and relative links as well as dynamically loaded resources. Sometimes to make certain saved pages function closer to how they originally operated, the `base` tag specifying the source page's URL may need to be added to the document.
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## Decision
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Adding the `base` tag should be optional. Saved documents should not contain the `base` tag unless it was requested by the user, or unless the document originally had the `base` tag in it. Only documents donwloaded from remote resources should be able to obtain a new `base` tag, existing `base` tags within documents saved from data URLs and local resources should be kept intact.
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The existing `href` attribute's value of the original `base` tag should be used for resolving document's relative links instead of document's own URL.
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There can be only one such tag. If multiple `base` tags are provided, only the first encountered tag will end up being used.
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## Consequences
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In case the remote document had the `base` tag in it:
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- By default: the `href` attribute should be resolved to a full URL if it's relative, kept empty in case it was empty or non-existent, all other attributes of that tag should be kept intact.
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- If `base` tag was requested to be added: the exsting `base` tag's `href` attribute should be set to page's full URL, all other attributes should be kept intact.
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In case the remote document didn't have the `base` tag in it:
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- By default: no `base` tag is added to the document, it gets saved to disk without having one.
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- If `base` tag was requested to be added: the added `base` tag should contain only one attribute `href`, equal to the remote URL of that HTML document.
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