float does not work in a flex container

问题

I want to position text (foo link) in right of the footer element.

I need footer display to remain flex.

But when I set it to flex, float:right for span doesn't work anymore.

<footer style="display: flex;">
     <span style="text-align: right;float: right;">
        <a>foo link</a>
     </span>
</footer>

https://jsfiddle.net/dhsgvxdx/

回答1:

The float property is ignored in a flex container.

From the flexbox specification:

3. Flex Containers: the flex and inline-flex display values

A flex container establishes a new flex formatting context for its contents. This is the same as establishing a block formatting context, except that flex layout is used instead of block layout.

For example, floats do not intrude into the flex container, and the flex container’s margins do not collapse with the margins of its contents.

float and clear do not create floating or clearance of flex item, and do not take it out-of-flow.

Instead, just use flex properties:

footer {
    display: flex;
    justify-content: flex-end;
}

<footer>
    <span>
       <a>foo link</a>
    </span>
</footer>

If you have more items in the footer, and need other alignment options, then here are two guides:

In CSS Flexbox, why are there no "justify-items" and "justify-self" properties?
How does flex-wrap work with align-self, align-items and align-content?

回答2:

It works if you add margin-left: auto; like I did here in the jsfiddle: https://jsfiddle.net/dhsgvxdx/3/

<body>
    <footer style="display: flex;">
        <span style="text-align: right;float: right; margin-left: auto;">
            <a>foo link</a>
        </span>
    </footer>
</body>

回答3:

If this footer is only to contain a right-aligned item, you can simply apply justify-content: flex-end to the flex container. This way, you do not have to add any styles to its children.

footer {
  display: flex;
  justify-content: flex-end;
}

Codepen example

来源：https://stackoverflow.com/questions/39194630/float-does-not-work-in-a-flex-container

标签

html

css

flexbox