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  1. Table of Contents
    How Affects Links and Resources
    You Can Also Set a Default Target
    Placement Matters
    Home Web Front-end H5 Tutorial What is the purpose of the tag in the document ?

    What is the purpose of the tag in the document ?

    Jun 30, 2025 am 01:50 AM

    The <base> tag in HTML is used to specify a base URL for all relative URLs in a document, which will affect the parsing of resources such as links, images, scripts, and stylesheets. For example, after setting , What is the purpose of the  tag in the document ? will be loaded from https://example.com/assets/image.jpg. In addition, <base> also supports the target attribute to define the default opening method of links, such as to open the links on a new tab page. However, it should be noted: 1. <base> must be placed in

    and before other reference URL elements; 2. If a single link has a custom target attribute, the base settings will be overwritten; 3. Use with caution in dynamic websites, mixed absolute/relative URLs, or reusable templates.

    The <base> tag in HTML is used to define a base URL for all the relative URLs in a document. It's one of those tags that many people skip over or forget, but it can be really useful — or even tricky — if you're not aware of how it works.

    When you set a <base> tag in your HTML document's , every relative URL inside that document will resolve based on the value of the href attribute in <base> . This includes links ( <a></a> ), images ( <img alt="What is the purpose of the tag in the document ?" > ), scripts ( <script></script> ), stylesheets ( <link> ), and more.

    For example:

     <base href="https://example.com/assets/">
    <img  src="/static/imghw/default1.png"  data-src="image.jpg"  class="lazy" alt="What is the purpose of the  tag in the document ?" > <!-- Actually loads from https://example.com/assets/image.jpg -->

    This can help simplify development if resources are always in a specific directory. But beware: once set, it affects all relative URLs , so you need to make sure your paths align with this base.

    Also, if you're linking internally using relative paths and you change the base URL, those links might point somewhere unexpected.

    You Can Also Set a Default Target

    In addition to the href attribute, the <base> tag supports a target attribute. This sets the default browser context (like a tab or window) for all links in the document.

    For example:

     <base target="_blank">
    <a href="https://example.com">Open Example</a>
    <!-- This link will open in a new tab by default -->

    You won't see this used often, but it can be handy in documentation sites or apps where external links should consistently open in a new tab without repeating the target="_blank" on every link.

    Just keep in mind:

    • The target only applies to elements that have a target attribute (mostly links).
    • If a specific link has its own target , it overrides the base setting.

    Placement Matters

    One important thing: the <base> tag must appear inside the section and should come before any other elements that use URLs , like <link> or <script></script> . Otherwise, some browsers might ignore it or apply it inconsistently.

    So putting it near the top of your ensures that all following relative URLs are resolved correctly.

    When Not to Use <base>

    While it can be helpful, there are cases when it's better to avoid it:

    • In dynamic websites where content moves between environments (dev, staging, prod), because it can cause confusion if not updated.
    • If you're mixing relative and absolute URLs heavily, since it adds another layer of indirection.
    • In templates or components that might be reused elsewhere — relying on a base URL can break assumptions.

    In short, it's a powerful tool, but needs to be handled carefully.

    Basically that's it.

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